Chloride mercurimetric determination

Chloride is determined by mercurimetric titration to the sodium nitroprusside end-point. Carbonates, acetates and borates do not interfere in the titration but large amounts of ammonium salts do interfere. The method has been applied to methyltrichlorosilane, dimethyldichlorosilane, diethyldichlorosilane, phenylmethyldichlorosilane and phenyltrichlorosilane. Methods have been described76,77 based on reaction with amines for the determination of chlorine directly linked to silicon in alkyl aryl chlorosilanes. One method76 is based on the formation of aniline hydrochloride according to the equation ... 

The mercurimetric determination with Hg(N03)2 titrant is carried out at pH 2.5 0.1 using diphenylcarbazon as the indicator of the end point, forming a violet compound with excess of mercury ions. The method is used for the determination of chlorides at concentrations > 4 mg F [13, 14]. 

The mixtures were equilibrated isothermally for 5 hours while being stirred by a stream of inert gas. The potassium content was determined by using a flame photometer, the dihydrogenphosphate was determined acldlmetrlcally using thymolphthaleln as indicator, and chloride was determined mercurimetrically. 

Chloride may be determined by mercurimetric titration, spectrophotometry, couiometric-amperometric titration, or, most commonly today, ISE. 

Complex formation is used extensively in water analysis. The determination of hardness, Ca and Mg concentration, employs the com-plexation of these metals with the chelating agent ethylenediaminetetra-acetic acid (EDTA) the titrimetric finish of the chemical oxygen demand (COD) test uses the complexing agent 1,10-phenanthroline to detect the presence of Fe and so indicate the endpoint chloride analysis by. the mercurimetric method depends on the formation of the complex HgCl taq) between Hg " and the chloride ion. 

Method 2.1 Determination of Chlorine in Polymers Containing Chloride and Sulfur and/or Phosphorus and/or Fluorine. Oxygen Flask Combustion - Mercurimetric Titration... 

METHOD 78 - DETERMINATION OF CHLORINE IN POLYMERS CONTAINING CHLORIDE AND SULPHUR AND/OR PHOSPHORUS AND/OR FLUORINE. OXYGEN FLASK COMBUSTION - MERCURIMETRIC TITRATION. 

---