ELIGIBILITY OF THE SPECTROSCOPIC TECHNIQUES TO QUANTIFY TOTAL INORGANIC ARSENIC CONCENTRATIONS IN DIFFERENT CLAY/SOIL MATRICES: METHOD OPTIMIZATION AND VALIDATION ASPECT

Theabilities of various analytical techniques to recover total inorganic arsenic fromsoils were investigated in this study. The atomic absorption spectrometryintegrated hydride generation system (HG-AAS), inductively coupled plasmaoptical emission spectroscopy (ICP-OES), microwave plasma coupled atomicemission spectroscopy with hydride generation (HG-MP-AES), and inductively coupledplasma mass spectrometry (ICP-MS) were utilized for capability identificationin total inorganic arsenic recovery from the soil. The validation of totalinorganic arsenic content were covered using NIST reference Montana 2710astandard. Analytical optimization followed for all techniques to utilizemaximum recovery from the techniques. Two different clay types were digested,kaolinite (Wards study pack, 46 E 0995) and montmorillonite (Wards study pack, 46E 0438) matrices were spiked for the performance validation in different matrices.The promising recovery of all methods were in elevated trace element concentrations(3 to 300 µg/L). The optimized method detection limits respectively 3.33, 1.07,9.78, 0.001 for µg/L for HG-AAS, ICP-OES, HG-MP-AES, and ICP-MS techniques. Selectedbest method of ICP-MS followed the matrix and matrix spike determination. Thecrystallographic mineralogical standards of kaolinite and montmorillonitematrices containing high and low total arsenic contents are 0.9028, 5.362 mg/kgrespectively. The spiked sample of the kaolinite resulted 67.7 whereasmontmorillonite provided 147.5% recovery for the results though, the highercompatible optimized system ICP-MS reflects deviation for recovery of differentsoil matrices. Further, the respective other instrumental methods has to betested for matrix and matrix spiked for the identification of suitable localsoil analysis.