کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1244270 | 969683 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Simultaneous kinetic spectrophotometric determination of cyanide and thiocyanate using the partial least squares (PLS) regression Simultaneous kinetic spectrophotometric determination of cyanide and thiocyanate using the partial least squares (PLS) regression](/preview/png/1244270.png)
The partial least squares (PLS-1) calibration model based on spectrophotometric measurement, for the simultaneous determination of CN− and SCN− ions is described. The method is based on the difference in the rate of the reaction between CN− and SCN− ions with chloramine-T in a pH 4.0 buffer solution and at 30 °C. The produced cyanogen chloride (CNCl) reacts with pyridine and the product condenses with barbituric acid and forms a final colored product. The absorption kinetic profiles of the solutions were monitored by measuring absorbance at 578 nm in the time range 20–180 s after initiation of the reaction with 2 s intervals. The experimental calibration matrix for partial least squares (PLS-1) calibration was designed with 31 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 10.0–900.0 and 50.0–1200.0 ng mL−1 for CN− and SCN− ions, respectively. The proposed method was successfully applied to the simultaneous determination of cyanide and thiocyanate in water samples.
Journal: Talanta - Volume 71, Issue 2, 15 February 2007, Pages 893–899