US EPA

4964355 

Journal Article 

QUANTITATIVE-DETERMINATION OF CHLORIDE BY MEANS OF FLOW-INJECTION ANALYSIS WITH SPECTROPHOTOMETRIC DETECTION IN THE UV-VIS RANGE 

Kramer, D; Rosenberg, E; Krug, A; Kellner, R; Hutter, W; Hampel, W 

1994 

1 

Microchimica Acta
ISSN: 0026-3672
EISSN: 1436-5073 

116 

4 

183-189 

10.1007/BF01260363 

WOS:A1994PL87600002 

Chloride is determined indirectly by spectrophotometric flow injection analysis. Two systems are compared, both based on the principle of ion exchange of easily detectable anions versus chloride from suitable mercury salts. The first method is based on the exchange of chloride with chloranilate which is detected at 332 nm or at 306 nm in neutral or in acidic medium respectively. In the second case, chloride reacts with Hg(SCN)2. The liberated thiocyanate forms a strongly coloured complex with FE(III) in acidic solution with an absorption maximum at 460 nm. Both methods have a detection limit of about 5 mumol Cl-/l (175 ng/ml). In the case of the thiocyanate method, the relative standard deviation is about 2% (7 measurements) in the range of 5 to 150 mumol/l and decreases significantly to a value of approximately 0.2% at higher concentrations; for the chloranilate method it is 10% for lower and about 1% for higher concentrations respectively. 

CHLORIDE DETERMINATION; FLOW INJECTION ANALYSIS; MERCURY; THIOCYANATE; CHLORANILATE