METHOD 9253 CHLORIDE (TITRIMETRIC, SILVER NITRATE)

CD-ROM9253 - 1 Revision 0 September 1994 METHOD 9253 CHLORIDE (TITRIMETRIC, SILVER nitrate ) AND METHOD is intended primarily for oxygen bomb combustates orother waters where the CHLORIDE content is 5 mg/L or more and where interferencessuch as color or high concentrations of heavy metal ions render METHOD OF adjusted to pH is titrated with SILVER nitrate solutionin the presence of potassium chromate indicator. The end point is indicated bypersistence of the orange- SILVER chromate , iodide, and sulfide are titrated along with the and polyphosphate interfere if present in concentrations greaterthan 250 and 25 mg/L, respectively. Sulfite and objectionable color or turbiditymust be eliminated. Compounds that precipitate at pH (certain hydroxides)may cause error by sodium carbonate from the bomb combustion may react withsilver nitrate to produce the precipitate, SILVER carbonate.

5.5 Potassium chromate indicator solution. Dissolve 50 g of potassium chromate (K 2Cr0 4) in 100 mL of reagent water and add silver nitrate (AgN0 3) until a slightly red precipitate is produced. Allow the solution to stand, protected from light, for at least 24 hours after the addition of AgN0 3. Then filter the

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  Nitrate, Potassium

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