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本文报告苯芴酮(Ⅰ)可作为比色测定铋之新试剂;Ⅰ与铋所成之橙色络合物的最大光吸收对试剂空白而言在480—500mμ,在此处之克分子消光系数约为35000。当有动物胶存在时,在适宜酸度下,(PH1.45—1.65),于室温显色半小时后至120分钟间颜色最深、消光恆定、试液清彻。宜于比色之铋(Ⅲ)浓度范围是:10r Bi/50ml至120r Bi/50ml,在此范围内(Ⅰ)(10~(-)MH_2SO_4 —乙醇溶液)的适宜用量为2—3ml测定液总体积50ml)。当铋(Ⅲ)为llr/50ml时,下列倍量的离子存往不干扰:之干扰可藉抗壤血酸掩蔽,lnl1％之抗壤血酸可消除1mgFe之影响。本法的测定准确度当Bi在11r/50nl时,最大相对误差为18.2％;在33rBi/50ml时为3.0％。本法经过初步验证,测定了大量镉存在下之微量铋,结果满意。文中表列了测得结果。本法相当灵敏,快速,完成一次分析只需约4小时,灵敏度可达约0.1r Bi/ml。
Benzene fluorenone (Ⅰ) can be used as a new reagent for the colorimetric determination of bismuth. The maximum absorption of orange complex formed by bismuth and bismuth is 480-500mμ for reagent blank, where the molar extinction coefficient About 35000. When there is animal glue, under suitable acidity, (PH1.45-1.65), at room temperature half an hour to 120 minutes after the deepest color, extinction constant, the test solution is clear. The suitable amount of bismuth (Ⅲ) to be used for colorimetric measurement is 10r Bi / 50ml to 120r Bi / 50ml. The suitable amount of (I) (10 ~ (-) MH_2SO_4-ethanol solution) Total volume 50ml). When bismuth (III) is llr / 50ml, the following times the amount of ions stored without interference: the interference can be masked by the anti-CD3 acid, lnl1% of anti-CDC can eliminate the impact of 1mgFe. The accuracy of the determination of this law when Bi at 11r / 50nl, the maximum relative error of 18.2%; 33rBi / 50ml 3.0%. After preliminary verification of this law, a large amount of trace bismuth in the presence of cadmium was determined and the results were satisfactory. The paper lists the measured results. This method is quite sensitive and fast, requiring only about 4 hours to complete an analysis with a sensitivity of about 0.1 rBi / ml.