MT 251-1991
Determination method of nitrite ion in coal mine water (English Version)

Standard No.

MT 251-1991

Language

Chinese, Available in English version

Release Date

1991

Published By

Professional Standard - Coal

Status

Be replaced 2000-05

Replace By

MT/T 251-2000

Latest

MT/T 251-2000

Scope

This standard specifies the N-(1-naphthyl)-1,2-ethylenediamine dihydrochloride colorimetric method for the determination of nitrite ions in various waters. This standard is applicable to the determination of nitrite ions in coal mine industrial water, domestic water, surface water, and groundwater. When 10 to 40 mL of test water sample is taken, the concentration range of nitrite ions measured is 0. 01 to 2.5 mg/L. Diluting the water sample can expand the measurement range. This standard does not apply to the determination of nitrite ions when the ferric ions in the test water sample are greater than 100 μg, thiosulfate ions are greater than 1000 μg, chlorine is greater than 2 μg, chloramine is greater than 5 μg, and sodium polyphosphate is greater than 50 μg.

MT 251-1991 history

• 2000 MT/T 251-2000 Determination method of nitrite ion in coal mine water
• 1991 MT 251-1991 Determination method of nitrite ion in coal mine water

MT 251-1991 Determination method of nitrite ion in coal mine water was changed to MT/T 251-2000 Determination method of nitrite ion in coal mine water.