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National standards
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Gas phase molecular absorption spectrometer test items

The gas phase molecular absorption spectrometry comes from the standard method of the national authoritative department. The standard number is as follows:

Ammonia nitrogenNH3-N HJ/T 195-2005

Kjeldahl nitrogenTKN HJ/T 196-2005

Nitrite nitrogenNO2-N HJ/T 197-2005

Nitrate nitrogenNO3-N HJ/T 198-2005

Total nitrogenTN HJ/T 199-2005

SulfideS2- HJ/T 200-2005