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偶氮氯磷Ⅲ在pH2.3测钙,镁几乎无影响,加入EDTA二钠盐能掩蔽许多离子的干扰,我们曾用于钛中微量钙的测定。但在pH2.3测钙比在pH7灵敏度降低很多,ε_(PH7)=6.4×10~4,ε_(PH2.3)=1.47×10~4。在化学反应中引入乙醇有时能加快反应速度,提高显色反应灵敏度和增加生成物的稳定性,近来已引起人们的注意。我们研究了乙醇对偶氮氯膦Ⅲ在pH2.3测钙的作用,发现加入乙醇能提高灵敏度,当乙醇浓度达到56％—64％吸光度最大且恒定,
Chlorophosphazene III at pH 2.3 measured calcium and magnesium almost no effect, adding EDTA disodium salt can mask the interference of many ions, we have used for the determination of trace amounts of titanium in titanium. However, the sensitivity of pH7 at pH2.3 is much lower than that at pH7. The pH value of PH7 is 6.4 × 10-4, and the value of PH2.3 is 1.47 × 10-4. The introduction of ethanol in chemical reactions can sometimes speed up the reaction rate, increase the sensitivity of the color reaction and increase the stability of the product, which has attracted people’s attention recently. We investigated the effect of ethanol on calcium chloride at pH 2.3 and found that the addition of ethanol increased the sensitivity. When the ethanol concentration reached 56% -64%, the absorbance was maximum and constant,