Standard No.:	GB/T 6909-2018
English Name:	Analysis of water used in boiler and cooling system—Determination of hardness
Chinese Name:	锅炉用水和冷却水分析方法 硬度的测定
Chinese Classification:	G76    Basic standards and general methods for water treatment agent
Professional Classification:	GB    National Standard
ICS Classification:	71.040.40 71.040.40    Chemical analysis 71.040.40
Issued by:	SAMR and SAC
Issued on:	2018-06-07
Implemented on:	2019-1-1
Status:	valid
Superseding:	GB/T 6909-2008 Analysis of water used in boiler and cooling system - Determination of hardness
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	160.0
Delivery:	via email in 1~3 business day

本标准规定了锅炉用水和冷却水中硬度的测定方法。本标准适用于锅炉用水和冷却水硬度的测定。本标准中的铬黑T法测定范围为0.01 mmol/L～5 mmol/L，超过5 mmol/L时，〖JP2〗可适当减少取样体积，稀释后测定；酸性铬蓝K法测定范围为〖JP〗???1 μmol/L～100 μmol/L；电位滴定法测定范围为0.25 mmol/L～10 mmol/L（均以Ca??2+?、Mg??2+?为基本单元)。本标准也适用于天然水、冷却水、软化水及锅炉给水硬度的测定。