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用隐蔽容量法研究了各种螯合剂对鈣、鉄(Ⅲ)、錫(Ⅳ)离子的隐蔽能力順序。鈣的隐蔽: pH4—11:乙二胺四乙酸二鈉>氨三乙酸>檸檬酸鈉》酒石酸鈉>苹果酸>葡萄糖酸鈉>乳酸、甘油酸(后二者几无隐蔽能力)。 1—15％氢氧化鈉溶液:葡萄糖酸鈉>酒石酸鈉>乙二胺四乙酸二鈉>氨三乙酸>檸檬酸鈉》苹果酸>乳酸、甘油酸(后二者已无隐蔽能力)。鈇(Ⅲ)的隐蔽: 微酸性溶液(pH4—6):氨三乙酸>酒石酸鈉>乙二胺四乙酸二鈉>檸檬酸鈉>葡萄糖酸鈉》苹果酸>乳酸、甘油酸。(后二者已无隐蔽能力) 中性至微碱性溶液:葡萄糖酸鈉>酒石酸鈉>乙二胺四乙酸二鈉>氨三乙酸>檸檬酸鈉》苹果酸>乳酸、甘油酸(后二者已无隐蔽能力)。 1—18％氢氧化鈉溶液:葡萄糖酸鈉>三乙醇胺。錫(Ⅳ)的隐蔽: pH3.6—5.8:檸檬酸鈉>葡萄糖酸鈉>苹果酸>酒石酸鈉>甘油酸>乳酸。
The concealment capacity of various chelating agents for Ca, 鉄 (Ⅲ) and tin (Ⅳ) ions was studied by the concealed capacity method. Calcium concealment: pH4-11: disodium ethylenediaminetetraacetate> nitrilotriacetic acid> sodium citrate> sodium tartrate> malic acid> sodium gluconate> Lactic acid, glyceric acid (the latter two are almost no hidden ability). 1-15% sodium hydroxide solution: sodium gluconate> sodium tartrate> disodium ethylenediaminetetraacetate> nitrilotriacetic acid> sodium citrate "malic acid> lactic acid, glyceric acid (the latter two have no covert ability).隐 (Ⅲ) Hidden: Slightly acidic solution (pH 4-6): Ammonium triacetate> Sodium tartrate> Disodium edetate> Sodium citrate> Sodium gluconate> Malic acid> Lactic acid, glyceric acid. (The latter two have no hidden ability) Neutral to slightly alkaline solution: Sodium gluconate> Sodium tartrate> Disodium ethylenediaminetetraacetate> Sodium triacetate> Sodium citrate> Malic acid> Lactic acid, Who have no hidden ability). 1-18% sodium hydroxide solution: sodium gluconate> triethanolamine. Hidden tin (IV): pH 3.6-5.8: Sodium citrate> Sodium gluconate> Malic acid> Sodium tartrate> Glyceric acid> Lactic acid.