This standard specifies the best method for determining nitrate ions in water. This method is applicable to the analysis of all types of water, but is especially intended for the analysis of contaminated water and salt water.
JIS K 0400-43-50:2000 history
2000JIS K 0400-43-50:2000 Water quality -- Determination of nitrate -- Part 2: 4-Fluorophenol spectrometric method after distillation