Measurement of Total Nitrogen/Total Phosphorus in Wastewater by TNPC-4110 Plus

Introduction

As a measure to improve eutrophication of closed bodies of water, total pollutant load control regulations were implemented in Japan from 1979 to reduce the total load of organic contaminants discharged into such waters to a standard value or less. Beginning with the 5^th Total Pollutant Load Control regulations, total nitrogen and total phosphorus were added and designated to the object items. Many places of business which are subject to those regulations measure these substances with automatic measuring devices. In a recent model change, Shimadzu improved the performance and functions of its TNPC-4110 series online total nitrogen/phosphorus analyzer, which had been used since the 5th Total Pollutant Load Control regulations were implemented, and now offers the new model as the TNPC-4110 Plus series. In the improved model, the thermal decomposition/ chemiluminescence method was adopted for measurement of total nitrogen. This method provides the same high oxidative decomposition capacity and enables detection with minimal interference as the previous model, and samples containing contaminants or sea water can be measured with virtually no interference effects. The reagent and measurement sequence were also improved in this series, and in total phosphorus measurement, the influence of contaminants was minimized as far as possible, enabling highly accurate measurement. This article introduces an example of measurement of samples containing seawater and minerals with the TNPC-4110 Plus.

April 23, 2020 GMT