GB/T 6909-2018: Analysis of water used in boiler and cooling system - Determination of hardness

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Scope

This Standard specifies the determination method for hardness of water used in boiler
and cooling system.
This Standard applies to the determination for hardness of water used in boiler and
cooling system. The determination range of chrome black T method in this Standard is
0.01mmol/L~5mmol/L. When it exceeds 5mmol/L, the sampling volume can be
appropriately reduced. Determine after dilution. The determination range of acid
chrome blue K method is 1μmol/L~100μmol/L. The determination range of
potentiometric titration is 0.25mmol/L~10mmol/L (both with Ca2+ and Mg2+ as basic
units). This Standard is also applicable to the determination of the hardness of natural
water, cooling water, demineralized water and boiler feed water.

Basic Data

Standard ID	GB/T 6909-2018 (GB/T6909-2018)
Description (Translated English)	Analysis of water used in boiler and cooling system - Determination of hardness
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G76
Classification of International Standard	71.040.40
Word Count Estimation	10,123
Date of Issue	2018-06-07
Date of Implementation	2019-01-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration