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本文进一步发现苹果酸能隐蔽大量钛(在pH5.5间),并能隐蔽钛滴定铁或铝,使钛干扰铁或铝的滴定得以消除。苹果酸亦能定量置换络合钛的EDTA,可用二甲酚橙为指示剂以硝酸铅滴定所释出的EDTA从而测得钛量。不为苹果酸隐蔽的离子如Zr~(+4)、Fe~(+3).Cu~(+2)、Ni~(+2)、Co~(+2),Zn~(+2)、Cd~(+2)、Al~(+3)(<2毫克)、Mn~(+2)(<1毫克)以及Pb~(+2)等不干扰钛的置换滴定,使测定钛的选择性相当高。会用此法以测定钛铁矿、钛铁合金和钛白粉中的钛,结果与标准方法相符。诚为一简便而又快速新法。此外,也发现苹果酸与乳酸(在pH5.5和pH3.5以PAN为指示剂,硝酸铜为滴定剂)有相似的隐蔽钛的能力。
This paper further finds that malic acid can conceal a large amount of titanium (between pH5.5) and can conceal the titration of iron or aluminum by titanium to eliminate the titration of titanium or iron or aluminum. The amount of titanium can also be determined by substituting malic acid for quantitatively complexing titanium complexed with EDTA, using xylenol orange as an indicator to titrate EDTA released by lead nitrate. The ions not masked by malic acid such as Zr ~ (+4), Fe ~ (+3) .Cu ~ (+2), Ni ~ (+2), Co ~ (+2), Zn ~ (+2) The titration of titanium did not interfere with the titration of titania by Cd ~ (+2), Al ~ (+3) (~2 mg), Mn ~ (+2) (~1 mg) and Pb ~ (+2) Sex is quite high. This method is used to determine titanium in ilmenite, ferrotitanium and titanium dioxide and the results are in accordance with standard methods. Sincerity is a simple and fast new law. In addition, malic acid has also been found to have similar ability to conceal titanium from lactic acid (PAN as an indicator at pH 5.5 and pH 3.5, titrant of copper nitrate).