Chlorine

-Residual Chlorine (By SM 4500-Cl B-2011)

Scope:

The iodometric method is suitable for measuring total chlorine concentrations greater than 1 mg/L in natural and treated waters. Not applicable to estuarine or marine waters.

Chlorine will liberate free iodine from potassium iodide (KI) solutions at pH 8 or less. The liberated iodine is titrated with a standard solution of sodium thiosulfate (Na2S2O3) with starch as the indicator. Titrate at pH 3 to 4 because the reaction is not stoichiometric at neutral pH due to partial oxidation of thiosulfate to sulfate.

Method Data

Method 4500-Cl B
Hold Time0.25 hour
PreservationChlorine in aqueous solution is not stable, and the chlorine content of samples or solutions, particularly weak solutions, will decrease rapidly. Exposure to sunlight or other strong light or agitation will accelerate the reduction of chlorine. Therefore, start chlorine determinations immediately after sampling, avoiding excessive light and agitation.
Sample Volume250 mL
Collection Methodgrab
Instrumentationspectrometer
Method RefernceSM 4500-Cl B

Analyte List

AnalyteFormulaCAS Number
ChlorineCl

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

Chlorine

Inorganic Anions by Ion Chromatography (By EPA 300.0)

Scope:

Part A of the test method covers the determination of common inorganic anions in drinking water, surface water, mixed domestic and industrial wastewaters, groundwater, reagent waters, solids (after extraction), leachates (when no acetic acid is used). Part B of the test method covers the determination of bromate, chlorate, and chlorite in drinking and reagent waters.

A small volume of sample, typically 50-100 uL, is introduced into an ion chromatograph. The anions of interest are separated and measured, using a system comprised of a guard column, separator column, suppressor device, and conductivity detector.

Method Data

Method 4500-Cl B
Hold Time0.25 hour
PreservationChlorine in aqueous solution is not stable, and the chlorine content of samples or solutions, particularly weak solutions, will decrease rapidly. Exposure to sunlight or other strong light or agitation will accelerate the reduction of chlorine. Therefore, start chlorine determinations immediately after sampling, avoiding excessive light and agitation.
Sample Volume250 mL
Collection Methodgrab
Instrumentationspectrometer
Method RefernceSM 4500-Cl B

Analyte List

AnalyteFormulaCAS Number
ChlorineCl

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

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