镉（Ⅱ）—7—碘—8—羟基喹啉—5—磺酸络合物吸附波的研究

在ｐＨ４．３的ＨＡｃ－ＮａＡｃ介质中，Ｃｄ（Ⅱ）与７－碘－８－羟基喹啉－５－磺酸（７－Ｉ－Ｈ２ＱＳ）生成络合物。有二苯胍存在下，于－０．６８Ｖ（ｖｓ．ＳＣＥ）产生一灵敏的极谱波，峰电流与Ｃｄ（Ⅱ）浓度在８．９×１０－９～２．２×１０－６ｍｏｌ／Ｌ浓度范围内呈线性关系。通过对该极谱波性质及反应机理的研究，证实其为络合物吸附波，络合比为１∶１，络合物带负电荷。方法用于铜矿中镉的测定，结果满意     

镉—卟啉—4（2—吡啶偶氮）间苯二酚的显色反应及机理研究

研究了４（２－吡啶偶氦）间苯二酚（ＰＡＲ）对镉与四（４－三甲胺基苯基）卟啉（ＴＡＰＰ）的催化反应,在ＰＨ８．５０的硼砂－盐酸缓冲介质中,单偶氮试剂ＰＡＲ能加速Ｃｄ（Ⅱ）的ＴＡＰＰ的反应,反应在室温下即刻完成,配合物组成为Ｃｄ（Ⅱ）：ＴＡＰＰ＝１：２,配合物稳定常数Ｋ稳＝２．６×１０＾６,最大吸收波长于４３１ｎｍ,表观摩尔吸光系数为４．４×１０＾５,Ｃｄ（Ⅱ）含量在０－４．４μｇ／１０ｍｌ范围内服从     

Interaction of non-ionic hydrogels with weak aromatic acids

Measurements are reported of the swelling behaviour at 20°C of poly (N isopropylacrylamide) (PNIPA) gels in aqueous solutions of two weak aromatic acids, phenol and resorcinol. For solute concentrations below 45 mmol/l the uptake of these solutions is similar. Due to selective solvation phenol exhibits an excess equilibrium concentration inside the gel of 5% over that in the surrounding bath, while for resorcinol, the excess is found to be 12%. At 50 mmol/l solute concentration, both systems display a volume transition accompanied by expulsion of the solvent. The solubility limits in water of these aromatic compounds, which are significantly different from each other (870 mmol/l and 9080 mmol/l respectively), are far above this critical concentration. In the collapsed condition the expelled liquid spreads on the surface of the phenol treated gel, while an ordered arrangement of separate droplets is generated in the case of resorcinol. In the latter case an acute contact angle was observed. It is also shown by acid-base titration that the PNIPA/water system may exhibit a slight ion exchanging character.