Give changing nitrate and nitrite results a rainfall, river-flow and sampling record that your team can review.
A river measurement describes water reaching one sampling point. When nitrate or nitrite changes after rainfall, the useful question is how the event developed at that point and what evidence can explain it. Define the monitoring reach, tributary connections and investigation window before comparing peaks or assigning a source.
Aquamonitrix can provide frequent, separate nitrate and nitrite results for a catchment deployment. Use that record to organise field observations and follow-up sampling. PMA can help review the sample intake, power supply, data connection and servicing arrangement for the proposed location.
Create a dated event record that another team member can revisit. Preserve the original time series as well as any chart or calculation prepared for discussion.
Record the intake location, sampled water body and relevant upstream connections. Keep a current site map and note abstraction, impoundment or tidal influence where relevant. A monitoring point alone does not establish a pollution source.
Retain rainfall and river level or flow information where available, including the source and timestamps. Mark the event window explicitly. A rainfall gauge some distance away may not describe conditions across the whole contributing catchment.
Keep nitrate and nitrite results, units, analyser status and service events. Record collected-sample locations and collection times, plus the sample delivery delay to the analyser. Note conditions that could change what reaches the intake.
Use the observed timing to choose follow-up locations and times under the study plan. Record why each location was selected, who will collect the samples and which analyses are needed. Keep unsuccessful visits and missing data in the record.
A lower concentration during a wet period does not necessarily mean less nitrogen moving through the reach. Concentration and water flow describe different parts of the event. Any load estimate needs an appropriate flow record, consistent units and an explicit calculation method.
Do not combine an isolated grab sample with a distant or unrelated flow measurement and present it as a measured event load. Identify the time interval represented, the treatment of missing results and the uncertainty in the flow data. Keep nitrate and nitrite separate unless a combined value is calculated on a common nitrogen basis.
Suppose nitrate falls while river flow rises after rainfall. Keep both observations and check the sampling timeline before describing the event as an improvement. If upstream and downstream records are compared, establish travel time and tributary contributions rather than pairing results simply because their timestamps match.
Review the intake position across expected water levels, sample preparation and service access. Discuss sediment, debris and changing sample conditions with PMA. Agree a practical inspection plan for the site's operating conditions.
Specify mains or remote power, communications coverage and the expected analysis schedule. Retain local data and analyser status where appropriate. Plan how interruptions, maintenance visits and collected-sample checks will appear in the study record.
PMA connects the measurement, installation and operating team. We help you review the application, select suitable instrumentation and plan commissioning, training and ongoing service.
Send PMA a site map, the catchment question, proposed monitoring duration and expected nitrate and nitrite ranges with units. Include water-level variation, access, power, communications and available flow data. We can review the analyser configuration and sample arrangement with the people who will operate the station.
Speak to the PMA team about your instruments, reagents or service requirements. Tell us what you need, and we’ll help you find the right next step.
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