GB/T 6910-2026Analysis methods for boiler water and cooling water - Determination of calcium - Complexometric titration (English PDF)

锅炉用水和冷却水分析方法　钙的测定　络合滴定法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

April 30, 2026

Implementation date

November 1, 2026

Scope

GB/T 6910-2026 is the English-translated version of 锅炉用水和冷却水分析方法　钙的测定　络合滴定法.

GB/T 6910-2026 is the Chinese national standard covering calcium in boiler and cooling water by EDTA titration - the hardness that becomes scale on a boiler tube and costs efficiency long before it costs the tube. It replaces GB/T 6910-2006 and has been in force since 1 November 2026. It was issued on 30 April 2026 and takes effect on 1 November 2026, replacing GB/T 6910-2006. This page is published from the official record of the 2026 edition; the clause text of a standard this recent is not yet in circulation, and the figures, limits and tables it contains are those of the document itself, delivered in full with the English translation.

Document preview — GB/T 6910-2026

National Standard of the People's Republic of China

ICS: 13.060.45
Classification: J 98
Replacing: GB/T 6910-2006

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

7 Result Calculation and Representation
8 Precision
9 Test Report

7 Result Calculation and Representation

The calcium ion content in the water sample is calculated according to formulas (1) to (4).

8 Precision

In the same laboratory, by the same operator using the same equipment, following the same testing methods, and within a short period of time, the same test object is subjected to... The absolute difference between two independent test results obtained from mutually independent tests shall not exceed the repeatability limit (r); otherwise, the test results shall not be considered valid. If the value exceeds 5%, the repeatability limit (r) is calculated according to formulas (5) to (7). In different laboratories, by different operators using different equipment, following the same testing methods, and independently testing the same object... The absolute difference between two independent test results obtained from the test shall not exceed the reproducibility limit (R), and the number of cases exceeding the reproducibility limit (R) shall not exceed [a certain threshold]. 5%, the reproducibility limit (R) is calculated according to formulas (8) to (10).

9 Test Report

The test report should include at least the following information.

---Please indicate the document number;

---Name of the water sample, sampling date, etc.;

---Testing methods used;

---Experimental Results;

---Abnormal phenomena observed during the experiment;

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Editions of GB/T 6910

Edition	Title	Revision	Status
GB/T 6910-2026	Analysis methods for boiler water and cooling water - Determination of calcium - Complexometric titration	current edition	Current
GB/T 6910-2006	Analysis methods for boiler water and cooling water - Determination of calcium - Complexometric titration	previous edition	In force until 1 November 2026

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