STUDIES OF MATRIX MODIFIERS IN THE DETERMINATION OF TIN BY GFAAS

In this paper, the mixed modifiers in the determination of tin by GFAA S were studied. The mechanisms of tin stabilized by two modifiers were inquired using X-ray diffraction analysis. The two modifiers can incr ease charring temperature up to 1 400 degrees C and 1 350 degrees C, r espectively. Mg(NO3)(2) would form a higher background absorption in t he. determination process for tin. It has more advantages to use Ni+Vc , such as extremely increasing charring temperature, improving the det ermination sensitivity, decreasing the background absorption and the m atrix interference. The measured results for the stream sediment sampl es are consistent with the certified value.