Water Pollution Continuous Monitoring Technology in Japan
Maintenance of Analyzers for Water Pollution Continuous Monitoring
b. Check the analyzer for insufficiency of reagents. Replenish or replace the reagents as necessary to prevent measurement missing due to lack of reagents. The solution feed rate can be confirmed simultaneously with the checking of the remaining amount of reagents.
c. Check the factors which may affect the measurement results, including the operational conditions of mixer and injection conditions of sample water and reagents.
d. Measurement and reference electrodes should be polished once every month and the solution contained in the reference electrode should be replenished or replaced at the same time.
e. Pipes should be cleaned or replaced as necessary depending on the contamination condition. Gas penetration-separation pipe should be cleaned with acid or replaced as necessary.
f. Waste solution after measurement is neutralized in the neutralization tank by hydrochloric acid solution, that is automatically fed, and then discharged into public water area. Check the waste solution using pH test paper before discharge to make sure that the solution is properly neutralized.
(2) Calibration
-Zero calibration: 0.1 mgCN/L reference solution
-Span calibration: 1.0 mgCN/L reference solution
(3) Cross check with the values measured by manual analysis
Cross check during maintenance is impossible due to the need of equipment and time. Samples collected manually or automatically should be sent to a laboratory equipped with proper analyzers and subject to the specified non-automatic analysis. Thus obtained data is used for cross check. It is recommended to perform an easy check of measured data using a water test kit.
