Standard No.:	GB/T 7480-1987
English Name:	quality - Determination of nitrate - Spectrophotometric method with phenol disulfonic acid
Chinese Name:	水质 硝酸盐氮的测定 酚二磺酸分光光度法
Chinese Classification:	Z16    Analysis methods for toxic substances in water
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	1987-3-6
Implemented on:	1987-8-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	115.00
Delivery:	via email in 1~3 business day

本标准适用于测定饮用水、地下水和清洁地面水中的硝酸盐氮。本方法适用于测定硝酸盐氮浓度范围在0.02～2.0mg/L之间。浓度更高时可分取较少的试份测定。最低检出浓度：采用光程为30mm比色皿时，试份体积为50ml时，最低检出浓度为0.02mg/L。灵敏度：当使用光程为30mm的比色皿，试份体积为50ml，硝酸盐氮含量为0.60mg/L时，吸光度约为0.6个单位。适用光程为10mm的比色皿，试份体积为50ml，硝酸盐氮含量为2.0mg/L时，其吸光度约0.7单位。干扰：水中含氯化物、亚硝酸盐、铵盐、有机物和碳酸盐时，可产生干扰。含此类物质时，应作适当的前处理，以消除对测定的影响。