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本文研究了苦杏仁酸作为钛的掩蔽剂和碘化钾作为汞的掩蔽剂的条件,钛汞共存时络合滴定的比例等。并拟定了钛汞合金中钛汞的连续络合滴定法。试验证明,苦杏仁酸在pH2.5～7时对钛有很强的络合能力,如用量恰当,可掩蔽大量的钛。苦杏仁酸对钛的络合能力,pH值低时,络合能力较强,pH值增大时,络合能力下降,特别是pH值在5以上,降低更为显著。例如,在pH=3时,800毫克的苦杏仁酸能掩蔽50毫克钛,在pH=4时,只能掩蔽25毫克钛,pH=5时,1200毫克的苦杏仁酸才能掩蔽50毫克钛。碘化钾对汞的掩蔽能力是由于汞离子与碘离子
In this paper, the conditions of mandelic acid as a masking agent of titanium and potassium iodide as a masking agent for mercury are described. And developed a titanium amalgam titanium mercury continuous complexometric titration. Experiments show that mandelic acid at pH 2.5 ~ 7 when the titanium has a strong ability to complex, such as the amount of appropriate, can mask a large number of titanium. Mandelic acid on the ability of titanium complex, low pH, the complexation ability, pH value increases, the complexation ability decreased, especially at pH above 5, the more significant decrease. For example, 800 mg of mandelic acid masks 50 mg of titanium at pH = 3, masks only 25 mg of titanium at pH = 4, and 1200 mg of mandelic acid masks 50 mg of titanium at pH = 5. The ability of potassium iodide to conceal mercury is due to mercury ions and iodide ions