水质 亚硝酸盐氮的测定 分光光度法
Water quality--Determination of nitrogen(nitrite)--Spectrophotometric method
1987-03-06
HJ 634-2012
土壤 氨氮、亚硝酸盐氮、硝酸盐氮的测定 氯化钾溶液提取-分光光度法
Soil-Determination of ammonium,nitrite and nitrate by extraction with potassium chloride solution-spectrophotometric methods
2012-02-29
SL 84-1994
硝酸盐氮的测定(紫外分光光度法)
Determination of nitrogen (nitrate) (Uitraviolet spectrophometric method)
1995-05-01
HJ T346-2007
水质 硝酸盐氮的测定 紫外分光光度法（试行）
2007-03-10
HJ/T 346-2007
水质 硝酸盐氮的测定 紫外分光光度法(试行)
Water quality-Determination of nitrate-nitrogen-Ultraviolet spectrophotometry
2007-03-10
HY/T 0345-2022
海水中痕量亚硝酸盐的测定 流动分析-重氮偶联-长光程分光光度法
Determination of seawater trace nitrite—Flow analysis,diazotization and spectrophotometric detection witha long path length flow cell
2022-09-26
GB/T 7480-1987
水质 硝酸盐氮的测定 酚二磺酸分光光度法
Water quality--Determination of nitrate--Spectrophotometric method with phenol disulfonic acid
1987-03-06
DZ/T 0064.60-2021
地下水质分析方法 第60部分:亚硝酸盐的测定 分光光度法
Methods for analysis of groundwater quality—Part 60：Determination of nitrite—Spectrophotometry