石墨炉原子吸收法测定锡的基体改进剂研究

研究了石墨炉原子吸收光谱法测定锡的混合基体改进剂,用转靶X射线衍射分析探讨了金属元素氧化还原性质不同的两类改进剂的稳定机理,两种改进剂能使锡的灰化温度分别提高到1400℃和1350℃,但Mg(NO₃)₂会对锡的测定造成较大的背景吸收,镍加抗坏血酸后可显示更多的优点,既使灰化温度提高500℃,测定灵敏度也提高2倍,同时又降低了背景吸收和基体干扰,用此法测定水系沉积物标样,结果一致.

Studies of Matrix Modifiers in the Determination of Tin by GFAAS

In this paper, the mixed modifiers in the determination of tin by GFAASwere studied. The mechanisms of tin stabilized by two modifiers were inquired using X-ray diffraction analysis. The two modifiers can increase charring temperature up to 1400 ℃ and 1350 ℃, respectively. Mg(NO₃)₂ would form a higher background absorption in the determination process for tin. It has more advantages to use Ni+Vc, such as extremely increasing charring temperature, improving the determination sensitivity,decreasing the background absorption and the matrix interference. The measured results for the stream sediment samples are consistent with the certified value.