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GB/T 7494-1987Water quality. Determination of anionic surfactants. Methylene blue spectrophotometric method (English PDF)

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Issued by

National Environmental Protection Agency

Level / Type

National · Recommended

Issue date

March 6, 1987

Implementation date

August 1, 1987

Scope

GB/T 7494-1987 (Water quality. Determination of anionic surfactants. Methylene blue spectrophotometric method) is available as an English-translated PDF.

GB/T 7494-1987 — This standard applies to the determination of drinking water, surface water, sewage and industrial wastewater low concentrations of methylene blue active substances, namely anionic surfactant.

Under the experimental conditions, the measured object is mainly LAS, sodium alkyl sulfonates and fatty alcohol, but may have some positive and negative interference.

When using 10mm pathlength cuvette sample volume is 100ml, the lowest concentration of the standard examination for 0. 05mg/L LAS, the detection limit of 2.

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Document preview — GB/T 7494-1987

National Standard of the People's Republic of China

ICS: 13.06
Classification: Z 16

Issued by: National Environmental Protection Agency

What this standard covers1
Document data2

What this standard covers

This standard applies to the determination of drinking water, surface water, sewage and industrial wastewater low concentrations of methylene blue active substances, namely anionic surfactant. Under the experimental conditions, the measured object is mainly LAS, sodium alkyl sulfonates and fatty alcohol, but may have some positive and negative interference. When using 10mm pathlength cuvette sample volume is 100ml, the lowest concentration of the standard examination for 0. 05mg/L LAS, the detection limit of 2. 0mg/L LAS.

Document data

International classification (ICS): 13.06.

Chinese classification (CCS): Z16.

Estimated length of the Chinese original: 8,859 words.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 6 pages — is available in the English PDF.

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