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苯亞磺酸(C_6H_5SO_2H)对于分析化学,具有很大意义,它可以沉淀四价鈇、鈾、鈦、錫等阳离子而作为四价元素的組試剂。它与鋯在酸性介質中析出的白色棉絮狀沉淀,經110℃烘干后测得的分子式为ZrO(C_6H_5SO_2)_2,由于沉淀的无定形需在800°～900℃灼燒成ZrO_2后称重。当希土元素存在时,鋯亦可利用苯亞磺酸或其鈉鹽来沉淀測定;試样中如有鋁和鈹,并不发生共沉。如有10毫克Fe~(3+)存在时,則所得的ZrO_2中含有小于0.01毫克的鉄;因此Fe~(3+)的含量大于10毫克时,鋯必須进行重沉淀。苯亞磺酸鈉与鋯的反应很灵敏,沉淀的溶解度很小。
Benzene sulfinic acid (C_6H_5SO_2H) is of great significance for analytical chemistry. It can precipitate cations of tetravalent aluminum, uranium, titanium and tin as the reagent of tetravalent element group. It with zirconium in acidic medium precipitation of white cotton-like, after drying at 110 ℃ measured the formula ZrO (C_6H_5SO_2) _2, due to precipitation of amorphous at 800 ° ~ 900 ℃ after burning into ZrO_2 weighed . When a rare earth element is present, zirconium may also be precipitated using benzene sulfinic acid or its sodium salt; if aluminum and beryllium are present in the sample, co-precipitation does not occur. If 10 mg of Fe ~ (3+) is present, the resulting ZrO 2 contains less than 0.01 mg 鉄; therefore, the zirconium must be reprecipitated when the Fe 3+ content is greater than 10 mg. The reaction between sodium benzenesulfonate and zirconium is very sensitive and the solubility of the precipitate is very small.