摘要
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．
In this paper, the mixed modifiers in the determination of tin by GFAAS were 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 1 400 ℃ and 1 350 ℃, respectively. Mg(NO 3) 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第6期861-865,共5页
Chemical Journal of Chinese Universities
