摘要
建立了一种以微晶酚酞作吸附剂分离富集痕量Co(Ⅱ)的新方法。探讨了α-亚硝基-β-萘酚(HL)及酚酞用量、盐的种类及用量、酸度等因素对Co2+富集率的影响,得到了分离富集钴(Ⅱ)的最佳条件,讨论了Co2+的富集机理。结果表明:控制pH值为5.0,在1.0g NaCl存在下,当2.0g/Lα-亚硝基-β-萘酚溶液用量和5%酚酞溶液用量分别为0.60mL和0.10mL时,Co2+与α-亚硝基-β-萘酚(HL)反应生成的红棕色螯合物沉淀CoL3被定量吸附在微晶酚酞上,Co2+被定量富集,而Zn2+,Mn2+,Al 3+,Cd2+在此条件下不被吸附,从而实现了Co2+与这些离子的定量分离。方法用于合成水样中微量Co2+的定量富集分离测定,富集率为99.8%～108.6%。
A novel separation and enrichment method of cobalt （Ⅱ） using microcrystalline phenolphthalein as adsorbent was established.The effect of addition amount of α-nitroso-β-naphthol（HL） and phenolphthalein,the type and dosage of salt,and acidity on the enrichment yield of Co^2＋ was investigated.The optimal separation and enrichment conditions of cobalt（Ⅱ） were obtained.The enrichment mechanism of Co^2＋ was discussed.The results showed that Co^2＋ could react with HL to form reddish brown chelate precipitate（CoL3） which was quantitatively adsorbed on microcrystalline phenolphthalein under the following conditions：at pH 5.0;in the presence of 1.0 g of NaCl;the dosages of 2.0 g/L HL and 5 % phenolphthalein solution were 0.60 mL and 0.10 mL,respectively.Consequently,Co^2＋ could be quantitatively enriched,while Zn^2＋,Mn^2＋,Al^3＋ and Cd^2＋ were not adsorbed under these conditions,realizing the quantitative separation of Co^2＋ from these ions.This method had been applied to the quantitative enrichment,separation and determination of micro Co^2＋ in synthetic water samples.The enrichment yield was 99.8 %-108.6 %.
出处
《冶金分析》
CAS
CSCD
北大核心
2011年第1期66-69,共4页
Metallurgical Analysis
关键词
钴(Ⅱ)
α-亚硝基-β-萘酚
酚酞
分离富集
cobalt（Ⅱ）
α-nitroso-β-naphthol
phenolphthalein
separation and enrichment
