给出的程序适用于原水和饮用水。该范围包括最大试验部分为25毫升的硝酸氮浓度高达0.2毫克/升。使用路径长度为40毫米的细胞和25毫升的试验部分，检测限在0003至0013毫克/升的范围内。

Procedure given is applicable to raw and potable water. The range covers a nitrat nitrogen concentration up to 0,2 mg/l using the maximum test portion of 25 ml. Using cells of path length 40 mm and a 25 ml test portion the limit of detection lies within the range 0,003 to 0,013 mg/l.