Surfactant effect on determination of Cu²⁺ and Cd²⁺ ions by ion-selective electrodes providing evidence for the discrepancy between the point of zero charge and the isoelectric p

详细信息    查看全文

• 作者：Senay Ta&#x15f ; cı ; oğ ; lu ; Deniz Ta&#x15f
• 关键词：Surfactant based separation processes ; Point of zero charge ; Isoelectric point ; Ion-selective electrodes ; Copper determination ; Cadmium determination ; CuS ; CdS ; Sodium dodecyl sulfate ; Cetyltrimethyl ammonium bromide ; Triton-X-100
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2007
• 出版时间：20 July 2007
• 年：2007
• 卷：302
• 期：1-3
• 页码：349-353
• 全文大小：182 K

文摘

The influence of the presence of some surface-active agents in the medium on determination of Cu²⁺ and Cd²⁺ ions via Orion ion-selective electrodes was investigated. Sodium dodecyl sulfate (SDS), cetyltrimethyl ammonium bromide (CTAB) and polyoxyethylene(10)isooctylphenyl ether (TX100) were used as anionic, cationic and non-ionic surface-active agents, respectively. SDS had minor effects on the potentiometric response of the ion selective electrode to Cu²⁺ ions while CTAB were observed to affect the determination of Cu²⁺ ions more remarkably. Both CTAB and TX100 caused to small decrements on the concentration readouts for Cd²⁺ ions but relatively large decrements were observed in the presence of SDS.

The results of this study provided evidence for the discrepancy between the isoelectric point and the point of zero charge values of CdS, and showed that the isoelectric point of CdS has a value close to 5.5.