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《Physical Testing and Chemical Analysis Part B Chemical Analysis》 2003-03
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2.5th DERIVATIVE POLAROGRAPHIC DETERMINATION OF COUMARIN SENSITIZED BY 3-CHLORO-2-HYDROXYPROPYL-TRIMETHYL AMMONIUM CHLORIDE (CHTMAC)

WANG Fu-min (Department of Chemistry, Weinan Teachers′ College, Weinan 714000, China)  
It was found that in a buffered solution of 0.1mol·L -1 KH_2PO_4-Na_2HPO_4 (pH 6.8) containing 6×10 -6mol·L -1 of CHTMAC, reductive wave of coumarin is observed at the peak potential of -1.60V (vs. SCE). The peak current of the reductive wave of coumarin is about two times higher than that in the absence of CHTMAC, and is separated clearly from the hydrogen wave. By the combined use of the addition of CHTMAC and the 2.5th derivative technique, the sensitivity of the polarographic determination of coumarin is remarkably enhanced. The 2.5th derivative polarographic peak currents (e″_p) of the reductive waves of coumarin keeps a linear relationship with its concentrations in the range of 4.0×10 -7~6.0×10 -5mol·L -1 (r=0.9998, n=10), and its detection limit is found to be 1.2×10 -7mol·L -1. RSD (n=13) is found to be 1.5% at the concentration level of 8×10 -6mol·L -1. The proposed method has been applied to the determination of coumarin in angeleica dahurica roots.
【Fund】: 渭南师院科研基金资助项目 ( 0 1yks0 19)
【CateGory Index】: O657.14
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