论文部分内容阅读
一般矿石中微量铝采用CAS光度法测定,用酒石酸或苦杏仁酸掩蔽钛的干扰,TiO_2的允许量最多达250微克。金红石含TiO_295%左右,所以直接测定其中的铝是困难的。CAS-CPB胶束增溶光度法测定铝比CAS的灵敏度高,但钛的干扰严重,经试验用酒石酸掩蔽钛,存在0.5毫克TiO_2就有明显正干扰,1毫克TiO_2使吸光度增加1倍;采用酒石酸—苦杏仁酸联合掩蔽效果较好,1.5毫克TiO_2基本无影响,但灵敏度有所降低,摩尔吸光系数为8.5×10~4,仍比CAS灵敏度高,可不经分离直接光度法测定金红石单矿物中的微量铝。
The trace aluminum in general ores is determined by CAS spectrophotometry with titanium intercalated with tartaric acid or mandelic acid to allow up to 250 micrograms of TiO 2. Rutile contains TiO 2 95% or so, so direct determination of aluminum is difficult. CAS-CPB micellar solubilization spectrophotometry was more sensitive than CAS, but the interference of titanium was serious. Tested by tartaric acid, titanium was masked with 0.5 mg TiO 2, and 1 mg TiO 2 increased the absorbance by 1 time. Tartaric acid - mandelic acid combined masking effect is good, 1.5 mg of TiO 2 basically no effect, but the sensitivity decreased, the molar absorption coefficient of 8.5 × 10 ~ 4, CAS sensitivity is still higher than the CAS can be determined without separation spectrophotometry rutile single mineral In the trace of aluminum.