GB/T 6909-2018 Active National standards

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

Publish Date: 2018-06-07 Implement Date: 2019-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 6909-2018

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for water treatment agents

ICS Name: Chemical analysis

Publish Date: 2018-06-07

Implement Date: 2019-01-01

Pages: 8 pages

Scope

This standard specifies the determination methods of hardness in boiler water and cooling water. This standard is applicable to the determination of hardness in boiler water and cooling water. The determination range of the chromotropic black T method in this standard is 0.01 mmol/L to 5 mmol/L. When the hardness exceeds 5 mmol/L, the sampling volume can be appropriately reduced and the determination can be carried out after dilution; the determination range of the acidic chromium blue K method is 1 μmol/L to 100 μmol/L; and the determination range of the potentiometric titration method is 0.25 mmol/L to 10 mmol/L (all based on Ca2+ and Mg2+ as the basic units). This standard is also applicable to the determination of hardness in natural water, cooling water, softened water, and boiler feedwater.