DIN EN 16318:2014 肥料. 微量元素的测定. 采用光度法(方法A)和分光光度检测离子色谱法(方法B)对铬(VI)的测定; 德文版本EN 16318-2013
Fertilizers - Determination of trace elements - Determination of chromium (VI) by photometry (method A) and by ion chromatography with spectrophotometric detection (method B); German version EN 16318:2013