The study, led by Ibrahim Sallieu Jalloh of the China University of Geosciences in Wuhan together with Shixiang Li, Guangjin Zhang, H. M. Wasif Rasheed, and Rashid Khurshid, is the first of its kind in Sierra Leone’s civil service. The researchers combined Social Exchange Theory, which holds that workplace relationships operate on reciprocity, with Social Information Processing theory, which explains how employees interpret managerial practices as social cues. According to the exchange logic, when an organization gives employees genuine influence over their daily tasks, scheduling, and work environment, employees perceive this as benevolence and respect. They respond in kind, first with emotional trust in their leaders and organization, then with energetic investment in their work, and finally with discretionary behaviors that benefit the whole agency. The information processing logic adds that participation and authentic leadership function as signals that employees decode to decide what kind of attitude and behavior is appropriate in their workplace.

Methodologically, the research used a quantitative cross-sectional design. Data were collected from eight key public sector departments in Sierra Leone using a structured 62-item questionnaire distributed through a drop-off-and-pick-up procedure over one month. Of 538 questionnaires handed out, 470 were returned, and after screening, 431 were deemed usable. The sample was predominantly male at 82.8 percent and young, with 66.1 percent aged between 18 and 30. More than 85 percent held a Bachelor’s or Master’s degree. Notably, while 60.6 percent had served their organization for 5 to 10 years, 60.8 percent had worked under their current supervisor for 3 years or less. The researchers argue this tenure gap is theoretically critical: employees are anchored in the organization but their relational contract with a specific leader is still new, which makes the building of trust and the role of authentic leadership especially significant in these fresh dyads.

The analytical engine of the study was Partial Least Squares Structural Equation Modeling, or PLS-SEM, run in SmartPLS 4. This variance-based technique is suited to complex conceptual models with many latent constructs, sequential multi-path mediation, and moderation, without imposing strict parametric assumptions. The researchers first validated the measurement model, confirming internal consistency with Cronbach’s alpha values ranging from 0.807 to 0.952, convergent validity with average variance extracted above the 0.50 threshold for every construct, and discriminant validity using both the Fornell-Larcker criterion and the more sensitive heterotrait-monotrait ratio, where all HTMT values fell below 0.90. Five items with weak loadings were dropped, leaving 57 indicators. Common method bias was addressed procedurally through anonymity and statistically through full collinearity tests and Harman’s single-factor check, which found the first factor explained only 34.2 percent of variance, well below the 50 percent cutoff.

The structural results read like a relay race. Participation in decision-making showed a very strong association with affective trust, with a path coefficient of 0.764. Affective trust then associated positively with work engagement at 0.573 and with affective commitment at 0.428. Work engagement associated with organizational citizenship behavior at 0.617, while affective commitment showed a complementary but weaker association at 0.200. Finally, citizenship behavior associated with employee performance at 0.633. The model explained 58.3 percent of the variance in affective trust, 52.9 percent in work engagement, 58.0 percent in affective commitment, 59.3 percent in citizenship behavior, and 40.1 percent in employee performance. Cross-validated redundancy was high for trust and engagement and modest for performance, which the authors attribute to unobserved institutional constraints that also shape in-role performance in public bureaucracies.

The sequential mediation tests are where the study delivers its most viral finding. The indirect pathway running from participation through trust, then engagement, then citizenship behavior, and finally to performance was significant with an estimated effect of 0.171. The parallel pathway through commitment was also significant but smaller at 0.041. When the researchers tested the direct path from participation to performance, it was non-significant, while the total indirect effect equaled the total effect, establishing full mediation. In plain terms, participation does not improve performance by itself. It works only when it first builds emotional trust, which then converts into engagement or commitment, which then expresses itself as voluntary extra-role behavior. The authors argue this unpacks the black box between managerial practice and performance outcome that has produced inconsistent findings across decades of participation research.

Authentic leadership, measured with the 16-item Authentic Leadership Questionnaire covering self-awareness, relational transparency, balanced processing, and internalized moral perspective, emerged as a critical boundary condition. The interaction between authentic leadership and affective trust was significant for both work engagement and affective commitment. Simple slope analyses showed that at high levels of authentic leadership, one standard deviation above the mean, the trust-to-engagement association strengthened from 0.452 to 0.694, and the trust-to-commitment association strengthened from 0.317 to 0.539. The researchers interpret this through Social Information Processing theory: authenticity is a salient social cue that shapes how employees interpret and express trust. When leaders are perceived as genuine, the conversion of trust into energetic involvement and emotional attachment is amplified. Interestingly, authentic leadership also showed direct associations with both attitudes, suggesting that even apart from trust, the mere presence of a genuine leader fosters engagement and attachment.

Why does this matter beyond Sierra Leone? The authors argue that in hierarchical, resource-constrained West African bureaucracies, participation is not just a human resource technique but a major organizational transformation. Employees accustomed to centralized power and high power distance may decode participative cues as more meaningful signals than employees in Western organizations where participation is routine. Affective trust also carries a built-in element of risk tolerance. In bureaucracies, speaking out or volunteering extra effort can carry professional risks including reprimand or exclusion. Trust acts as a psychological buffer that changes the employee’s risk calculus, allowing risk-averse civil servants to engage in the discretionary, innovative behavior that improves public service provision without fear of bureaucratic punishment. Given that formal material incentives are often restricted in the public sector, relational exchange becomes the primary currency of motivation.

The study’s practical implications are direct. Public sector organizations may consider strengthening participative mechanisms such as employee consultation, feedback, and involvement in relevant work-related decisions where institutional conditions permit. Leadership development emphasizing transparency, ethical conduct, openness, and consistency may amplify the conversion of trust into engagement and commitment. Initiatives supporting engagement, recognition, professional development, and constructive citizenship behaviors may form part of broader employee-management strategies. The findings suggest an integrated approach combining participation, authentic leadership, employee engagement, and supportive work conditions, adapted to organizational resources and structures.

The authors are careful about limits. The cross-sectional design cannot establish causal ordering, and employees who perceive themselves as high performers may subsequently report greater trust and engagement. Self-reported measures leave room for halo effects and social desirability, and the strong association between work engagement and citizenship behavior indicates conceptual and perceptual proximity that should be acknowledged. Convenience sampling limits external validity, and the gender imbalance reflects context-specific constraints in digital access and survey participation. Future research should employ longitudinal or cross-lagged panel designs, multi-source data including supervisor ratings and peer assessments, and objective performance measures such as civil service ratings or citizen satisfaction surveys. Testing the model across private enterprises and varied cultural settings would confirm whether the sequential social exchange process is universal. Still, for the first time, the invisible machinery connecting a manager’s invitation to participate and a civil servant’s measurable output has been mapped end to end, and trust sits at the center of it all.

Subject of Research: A social exchange perspective on employee performance in Sierra Leone’s public sector: the roles of authentic leadership, participative decision-making, and trust

Article Title: A social exchange perspective on employee performance in Sierra Leone’s public sector: the roles of authentic leadership, participative decision-making, and trust

Article References: A social exchange perspective on employee performance in Sierra Leone’s public sector: the roles of authentic leadership, participative decision-making, and trust. (n.d.). https://doi.org/10.3389/fpsyg.2026.1885753

Image Credits: AI Generated

DOI: 10.3389/fpsyg.2026.1885753

Keywords: social, exchange, perspective, employee, performance, Sierra, Leone, public, sector, roles, authentic, leadership

The problem begins with a deceptively simple assumption. For decades, riverbank filtration and managed aquifer recharge systems have been evaluated as if the hydraulic gradient between a river and its aquifer were roughly constant. Water infiltrates, sediments and microbes remove some pollutants, and cleaner water emerges at the well. But field conditions are rarely steady. Storms raise river stage within hours, seasonal recharge resets regional groundwater levels, coastal tides alternate infiltration and discharge over hourly cycles, and human pumping and dam operations bend the flow field at will. Each of these forcings changes the magnitude and direction of water exchange, expands or contracts the active exchange zone, and redistributes the travel and residence times of every water parcel crossing the boundary.

The consequences for organic micropollutants, or OMPs, are profound. When a flood raises the river head above the adjacent groundwater, the prevailing gradient can weaken or reverse entirely. River water loaded with carbamazepine, sulfamethoxazole, benzotriazole, and other persistent compounds is pushed into bank sediments and riparian aquifers that routine conditions never reach. Field monitoring at Danube riverbank filtration transects between 2014 and 2016 captured this directly: two flood events increased riverine loads of these compounds, and groundwater concentrations during flooding could exceed simultaneous river concentrations and extend farther into the aquifer than routine monitoring would suggest. The review is careful to note that this result cannot be read as event-specific degradation or formation from synchronous concentration pairs alone, because the sampled groundwater may reflect antecedent source concentrations, mixing, and a distribution of travel times.

Here the review introduces one of its central integrative concepts: hydrologically realized mobility. Molecular properties such as polarity, charge, and hydrophobicity constrain sorption and persistence, but they do not uniquely predict whether a compound will actually cross the surface water–groundwater interface during a given event. Hydrodynamics determine whether intrinsic mobility is expressed as cross-interface transport. The testable proposition is that the same compound and source pulse will yield different arrival times and exported mass when forcing redistributes pathways, even if chemistry is unchanged. Paired conservative-tracer and OMP breakthrough across contrasting events would support this proposition; unchanged OMP response after demonstrable pathway and river-fraction changes would weaken it. Mobility, in this framing, is an event-specific outcome to be quantified, not a compound property to be assumed.

Once contaminants enter the interface, the event sequence unfolds in stages. During infiltration, the instantaneous contaminant input rate is the product of the surface-water concentration and the normal Darcy flux integrated over the infiltrating boundary. Advection controls the mean direction of transport, while dispersion and media heterogeneity distribute contaminant mass among pathways of different lengths and residence times. A single input pulse can therefore produce distributed arrival times and breakthrough magnitudes. When flow reverses and the river stage falls, infiltrated water drains gradually back to the channel as bank-storage return flow, and some infiltrated river water remains stored in the aquifer long after the storm. Hydrological modeling shows that bank-storage water may return to the river after recession or remain in the aquifer, with event timing changing water ages and return-flow fractions. For OMPs, the corresponding contaminant-mass routes are hypotheses until parent concentrations, fluxes, and stored pools are measured through the event.

Retardation and temporary storage add further complexity. Solid–water partitioning can slow OMP movement relative to the carrier water, and in heterogeneous media reversible sorption and slow mass exchange contribute to retardation and tailing. A field injection experiment resolved depth-dependent pesticide retardation against a conservative tracer, showing that sorption behavior can vary substantially within a single aquifer. But a delayed aqueous tail alone does not demonstrate that OMP mass was stored in sediment or a slow domain. Verifying contaminant storage requires a parent-compound mass balance, a measured sorbed pool, or a release perturbation. The review distinguishes three hydrologic-response classes: mobile–persistent compounds that traverse the interface rapidly or over long distances with little loss, mobile–reactive compounds whose fate depends on reactive exposure and pathway timing, and reversibly retarded compounds that show delayed arrival, tailing, and possible clean-water release. These classes are hypotheses about dominant responses, not fixed compound labels, and a compound may move between classes across sites or hydrologic phases.

Remobilization is where the story turns from storage to secondary source. When a flood recedes, stage declines, or slow pathways reconnect, untransformed OMP mass in slow-exchange domains or on reversible sorption sites may return to the mobile phase. Laboratory evidence is direct: in triplicate riverbed-sediment columns fed with contaminant-free tap water, previously retained compounds entered the effluent, demonstrating remobilization under controlled conditions. The field-scale significance of such release during flood recovery remains untested. Temporary storage can switch the functional role of the interface across event phases: enhanced infiltration creates a temporary sink that suppresses immediate output, whereas untransformed stored mass can become a potential secondary source during recovery. The interface can be described as a potential secondary source only when mass balance, parent compound–transformation product relations, or conservative–reactive tracer comparisons exclude transformation and dilution. Whether delayed release creates an environmentally relevant secondary pulse remains unresolved.

Reaction conditions add a dynamic dimension. Infiltrating surface water supplies dissolved oxygen and electron acceptors, while respiration consumes them along flow paths, creating redox zonation that shifts with temperature, organic carbon supply, and exchange. At the wastewater-impacted River Erpe, suspect screening along preset 35-centimeter hyporheic flow paths retained 130 aqueous trace organic contaminants after quality filters; 58 showed decreases, 63 showed no attenuation, and seven increased. Among the 58 attenuated compounds, 51 had higher estimated rates in the oxic than the suboxic segment. Recent simulated riverbank filtration experiments further show that sequential oxidizing–reducing conditions can improve removal of some recalcitrant OMPs, including irbesartan, benzotriazole, and gabapentin, relative to exclusively oxidizing or reducing conditions, accompanied by distinct redox-driven microbial specialization. The sequence of reaction environments encountered by a contaminant may be more informative than a single redox measurement. The review frames this as a dynamic reaction area: a compound-specific, time-dependent volume where transported OMP mass encounters conditions favorable for transformation. The testable proposition is that OMP transformation rises when event-driven pathway redistribution increases overlap between the OMP pulse and favorable reaction conditions, after conservative transport and mixing are controlled.

Antecedent state, or the memory of the interface, may be the most underappreciated control. Earlier low-flow, high-flow, drought, or stage-fluctuation periods change pore-water composition, redox state, microbial communities, and stored solute mass. Process-based simulations of successive peak flows show that event separation relative to system memory controls whether residence-time effects carry into a later peak. Intermittent-flow OMP columns provide controlled evidence that drying changes microbial composition and transformation routes for selected compounds. A thermo-hydro-biogeochemical model found that low mean stage during drought amplified the effects of high-frequency stage fluctuations on hyporheic temperature and biogeochemical reaction patterns. These sources support a hypothesis of history-dependent OMP fate, but direct event-resolved field tests remain scarce. The testable prediction is that matched current forcing and source inputs yield different OMP breakthrough or recovery when measured pre-event storage or reaction states differ.

The methodological implications are stark. Low-frequency and asynchronous sampling can miss the hydrologic phases that control transport entirely. At one Rhine riverbank filtration site, modeling linked high floods to river-to-well travel times shorter than eight days compared with a routine 25-to-40-day range, while low-flow conditions lengthened modeled residence to about 60 days. A fixed calendar lag may miss the contributing source period. Synchronous surface-water and groundwater concentration ratios are only apparent contrasts, not parcel-based removal fractions or proof of transformation. The review prescribes a hierarchy: constrain hydrodynamics and travel-time distributions first with groundwater levels, electrical conductivity, stable isotopes, and other conservative tracers, and only then estimate compound-specific retardation and reaction parameters. Validation should be partitioned by hydrologic state or independent event, not randomly. A model demonstrates cross-state predictive skill only if it reproduces the hydraulic response, travel-time distribution, arrival time, and OMP breakthrough in independent events without recalibrating key parameters. If dispersion, sorption, or degradation parameters must be adjusted for every flood, the result is event-specific fitting rather than an early-warning model.

Exposure assessment must also change. The review proposes event-resolved metrics: first arrival, peak concentration, exposure duration, cumulative breakthrough mass, and recovery time, each with explicit uncertainty and decision thresholds. At a full-scale riverbank filtration system in the Shepperton gravels, monitored flood inundation raised dissolved organic carbon to approximately 140 percent of baseline and mean well dissolved oxygen to approximately 440 percent of baseline, while micro-organic contaminant detections also increased. Most flood water-quality effects occurred during the first two to three weeks, with a return toward baseline conditions within about six weeks. The end of inundation is not necessarily the end of elevated exposure. Recovery time deserves particular emphasis, and compound- and site-specific decision thresholds and sensitive receptors would be required to extend these transport metrics into a formal health or ecological risk assessment.

The central knowledge gap remains direct event-scale field mass balances linking OMP storage to delayed release. Within the literature corpus assessed, transient water exchange and changing water ages are supported mainly by hydrological studies; direct event-scale field mass balances were not identified. Direct remobilization is demonstrated in a controlled clean-water column test, whereas a field event-scale balance from OMP input through storage and delayed release was not found. The next priority is event-triggered monitoring from rising stage through recovery, paired with time-dependent source–response matching and pathway-resolved reaction measurements. The central question shifts from whether one flood increases an OMP concentration to the following: under which combinations of antecedent state, inter-event interval, and hydrologic disturbance does OMP breakthrough or delayed release exceed a site-defined exposure threshold, and how long does that condition persist after the event? Until independently validated OMP event data are available, this remains a research agenda. But the message is already clear: the riverbank is not a filter. It is a dynamic, history-laden archive that opens and closes with every storm, and we have only just begun to read it.

Subject of Research: Effects of transient surface water–groundwater exchange on the transport of organic micropollutants: temporary storage, retardation, and remobilization

Article Title: Effects of transient surface water–groundwater exchange on the transport of organic micropollutants: temporary storage, retardation, and remobilization

Article References: Effects of transient surface water–groundwater exchange on the transport of organic micropollutants: temporary storage, retardation, and remobilization. (n.d.). https://doi.org/10.3389/frwa.2026.1980968

Image Credits: AI Generated

DOI: 10.3389/frwa.2026.1980968

Keywords: Effects, transient, surface, water, groundwater, exchange, transport, organic, micropollutants, temporary, storage, retardation