Simplex design method in simultaneous spectrophotometric determination of silicate and phosphate in boiler water of power plant and sewage sample by partial least squares
محورهای موضوعی : Journal of the Iranian Chemical Research
Ali Mohammad Hajishabani
1
(
Chemistry Department, Faculty of Sciences, Yazd University, Yazd, Iran
)
Masoud Rohani Moghadam
2
(
Chemistry Department, Faculty of Sciences, Yazd University, Yazd, Iran
)
Shayesteh Dadfarnia
3
(
Chemistry Department, Faculty of Sciences, Yazd University, Yazd, Iran
)
Jahanbakhsh Ghasemi
4
(
Chemistry Department, Faculty of Sciences, K. N. Toosi University of Technology, Tehran, Iran
)
کلید واژه: phosphate, Silicate, PLS, Boiler water, sewage, Simplex,
چکیده مقاله :
Partial least squares modeling as a powerful multivariate statistical tool was applied tothe simultaneous spectrophotometric determination of silicate and phosphate in aqueoussolutions. The concentration range for silicate and phosphate were 0.02-0.6 and 0.4-3 μg ml-1,respectively. The experimental calibration set was composed with 30 sample solutions using amixture design for two component mixtures. The absorption spectra were recorded from 500 to900 nm. The optimum conditions were obtained by simplex optimization method. The values ofroot mean square error of prediction (RMSEP) for silicate and phosphate using partial leastsquares (PLS) were 0.0017 and 0.02 μg ml-1, respectively. The effects of various cations andanions on detection of silicate and phosphate were investigated. The method was successfullyused for determination of silicate and phosphate in boiler water at power plant, well water andsewage samples.
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