Determination of Trace Amounts of Gold in Environmental Samples by Adsorptive Stripping Voltammetry of Its Complex with Rhodamine Using Osc-Pls

الموضوعات :

A. Akrami ¹ , A. Niazi ² , F. Bagheban-Shahri ³

1 -
2 -
3 -

تاريخ الإرسال : 26 الثلاثاء , صفر, 1434 تاريخ التأكيد : 20 الإثنين , صفر, 1440 تاريخ الإصدار : 14 السبت , شوال, 1433

الکلمات المفتاحية: Determination, PLS, Stripping, gold, Voltammetric, OSC,

ملخص المقالة :

The multivariate calibration method was applied for the determination of trace amounts of gold based on a hanging mercury drop electrode (HMDE) in the presence of rhodanine, followed by reduction of adsorbed gold by voltammetric scan using differential pulse modulation The optimum experimental conditions are: rhodanine concentration of 0.20 mg mL-1, pH 5.0, accumulation potential of -600 mV versus Ag/AgCl, accumulation time of 100 sec, scan rate of 30 mV s-1 and pulse height of 100 mV. The calibration matrix for partial least squares (PLS) regression was designed with 9 samples. Orthogonal signal correction (OSC) is a preprocessing technique used for removing the information unrelated to the target variables based on constrained principal component analysis. OSC is a suitable preprocessing method for PLS calibration without loss of prediction capacity using electrochemical method. The RMSEP for gold determination with PLS and OSC-PLS were 8.51 and 1.94, respectively. This procedure allows the determination of gold in synthetic and real samples with good reliability of the determination. 

المصادر:

1. Machida K, Enyo M, Adachiand G, Shiokawa J (1987)
2. Synthesis and electrocatalytic properties of rare earth
3. platinum and palladium bronzes. Bull Soc Jpn 60:411-
5. Ensafi AA, Keyvanfard M (2002) Kineticspectrophotometric
6. determination of palladium in
7. hydrogenation catalyst by its catalytic effect on the
8. oxidation of pyrogallol red by hydrogen peroxide.
9. Spectrochim Acta Part A 58:1567-1572.
10. Niazi A, Ghasemi J, Zendehdel M (2007) Simultaneous
11. voltammetric determination of morphine and noscapine
12. by adsorptive differential pulse stripping method and
13. least-squares support vector machines. Talanta 74:247-
15. Ghasemi J, Niazi A, Ghorbani R (2006) Determination
16. of trace amounts of lorazepam by adsorptive cathodic
17. differential pulse stripping method in pharmaceutical
18. formulations and biological fluids. Anal Lett 39:1159-
20. Niazi A (2007) Adsorptive stripping differential pulse voltammetry for determination of trace amounts of noscapine in human plasma. J Chin Chem Soc 54:1195-1200.
21. Li TH, Zhao QL, Huang MH (2007) Adsorptive anodic stripping voltammetry of zirconium-alizarins red s complex at a carbon paste electrode. Microchim Acta 157:245-249.
22. Babaei A, Shams E, Samadzadeh A (2006) Simultaneous determination of copper, bismuth and lead by adsorptive stripping voltammetry in the presence of thymolphthalexone. Anal Sci 22:955-959.
23. Zarei K, Atabati M, Ilkhani H (2006) Catalytic adsorptive stripping voltammetry determination of ultra trace amount of molybdenum using factorial design for optimization. Talanta 69:816-821.
24. Gholivand MB, Romiani AA (2006) Application of adsorptive stripping voltammetry to the simultaneous determination of bismuth and copper in the presence of nuclear fast red. Anal Chim Acta 571:99-104.
25. Pirch R, Kubiak WW (2007) Determination of trace arsenic with DDTC-Na by cathodic stripping voltammetry in presence of copper ions. J Electroanal Chem 599:59-64.
26. Martens H, Naes T (1989) Multivariate Calibration. John Wiley Chichester.
27. Ghasemi J, Niazi A, Leardi R (2003) Genetic-algorithm-based wavelength selection in multicomponent spectrophotometric determination by PLS application on copper and zinc mixture. Talanta 59:311-317.
28. Ghasemi J, Niazi A (2005) Two- and three-way chemometrics methods applied for spectrophotometric determination of lorazepam in pharmaceutical formulations and biological fluids. Anal Chim Acta 533:169.
29. Ghasemi J, Ebrahimi DM, Hejazi L, Leardi R, Niazi A (2006) Simultaneous kinetic-spectrophotometric determination of sulfide and sulfite and genetic algorithim variable selection using partial least squares calibration. J Anal Chem 61:92-98.
30. Niazi A, Sadeghi M (2006) PARAFAC and PLS applied to spectrophotometric determination of tetracycline in pharmaceutical formulation and biological fluids. Chem Pharm Bull 54:711-713.
31. Niazi A (2006) Simultaneous spectrophotometric determination of Fe (II) and Fe (III) in pharmaceuticals by partial least squares with chromogenic mixed reagents. Croa Chem Acta 79:573-579.
32. Wold S, Antii H, Lindgren F, Ohman J (1998) Orthogonal signal correction of near-infrared spectra. Chemom Intell Lab Syst 44:175-185.
33. Sjoblom J, Svensson O, Josefson M, Kullberg H, Wold S (1998) An evaluation of orthogonal signal correction applied to calibration transfer of near infrared spectra. Chemom Intell Lab Syst 44:229-244.
34. Andersson CA (1999) Direct orthogonalization. Chemom Intell Lab Syst 47:51-63.
35. Fearn T (2000) On orthogonal signal correction. Chemom Intell Lab Syst 50:47-52.
36. Westerhuis JA, Jong S, Smilde AK (2001) Direct orthogonal signal correction. Chemom Intell Lab Syst 56:13-25.
37. Wold S, Trygg J, Berglund A, Antii H (2001) Some recent developments in PLS modeling. Chemom Intell Lab Syst 58:131-150.