Citation: Hong Wen GAO. β CORRECTION SPECTROPHOTOMETRY FOR DETERMINATIONS OF COMPLEX RATIO OF METAL CHELATE AND ITS TRUE MOLAR ABSORPTIVITY[J]. Chinese Chemical Letters, ;1995, 6(2): 129-130. shu

β CORRECTION SPECTROPHOTOMETRY FOR DETERMINATIONS OF COMPLEX RATIO OF METAL CHELATE AND ITS TRUE MOLAR ABSORPTIVITY

Hong Wen GAO

Huaibei Environmental Monitoring Centre, Huaibei, 235000

Received Date: 5 September 1994

The mathematical equations of the effective percentage of a complexant and its complex-ratio with a metal have been developed by means of the β-correction pinciple.From a real abeorbance of the chelate produced,its true abeorptivity can be determined accurately.The β-correction spectrophotometry was studied for the determinations of the desired parameters above,using the reaction of lead with Eriochrome Black T(EBT)at pH 8.2.The results show that the analytical ansitivity and precision by β-correction method are both much higher than those by the single wavelength method,the complex-ratio of Pb(Ⅱ)with EBT equals to 1:4 and the true molar absorptivity of Pb(EBT)₄chelate at 550 nm is 3.53×10⁴L.mol^-1.cm^-1.
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