NEMI Method Summary

Method Summary Information

Method Number: D4458 Media: WATER
Revision: 1994
Method Source: ASTM International
Subcategory: INORGANIC Analytes in this method
Official Name: Standard Test Method for Chloride Ions in Brackish Water, Seawater, and Brines
Descriptive Name Chloride in Water
Source Info: ASTM International
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Citation: ASTM Volume 11.02
 
Brief Method
Summary:
 This test method is based upon the Mohr procedure for determining chloride ion with silver nitrate. The chloride reacts with the silver ion before any silver chromate forms, due to the lower solubility of silver chloride. The potassium chromate indicator reacts with excess silver ion to form a red silver chromate precipitate. The end point is the appearance of the first permanent orange color. This test method is suitable for analyzing solutions with a pH between 6.0 and 8.5.
Scope And
Application:
 This test method is applicable to the measurement of chloride in highly mineralized waters such as oil field brines, seawater, and brackish water. The test method is based upon the titration of chloride with silver nitrate, using a visual indicator.
Applicable
Conc Range:
 10 - 150 mg
Interferences: Sulfide, bromide, iodide, thiocyanate, cyanide, phosphate, sulfite, carbonate, hydroxide, and iron interfere in this test method. Sulfide, sulfite, and thiosulfate can be removed with a peroxide treatment, but usually no attempt is made to remove bromide and iodide because they are usually present in insignificant quantities compared to chloride. If necessary, the pH can be raised and the hydroxides of several metals, including iron, can be filtered off. Iron, barium, lead, and bismuth precipitate with the chromate indicator.
QC Requirements:
Sample Handling: Collect the sample in accordance with Practices D 3370.
Max Holding Time:
 
Relative Cost: Unknown
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