Saleh M B
Chemistry Department, Minia University, Egypt.
Fresenius J Anal Chem. 2000 Jul;367(6):530-4. doi: 10.1007/s002160000374.
Bis(diarylphosphine oxide) naphthalene compounds are used as novel ionophores in plasticized poly(vinyl chloride) matrix membrane sensors for barium ions. The most favorable sensor was 1,2-bis(diethylphenylphosphine oxide)naphthalene containing potassium tetrakis(4-chlorophenyl)borate as lipophilic salt and o-nitrophenyloctyl ether as plasticizer for ion-selective electrode membrane construction. The electrode showed excellent properties. It gave a linear response with a Nernstian slope of 30 mV per decade within the concentration range 10(-1)-10(-5) mol L(-1) BaCl2. The electrode exhibits a high selectivity towards Ba2+ with respect to Li+, Na+, K+, Rb+, Cs+, NH4+, Ag+, Mg2+, Ca2+, Sr2+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pb2+, Al3+, La3+, and Ce3+ ions. The electrode response was stable over a wide pH range (3-11). The lifetime of the electrode was about 2 months. It was successfully applied to the determination of Ba2+ contents in some rocks.
双（二芳基氧化膦）萘化合物被用作增塑聚氯乙烯基质膜传感器中用于钡离子的新型离子载体。最理想的传感器是1,2 - 双（二乙苯基氧化膦）萘，它含有四（4 - 氯苯基）硼酸钾作为亲脂性盐，邻硝基苯基辛基醚作为离子选择电极膜构建的增塑剂。该电极表现出优异的性能。在10(-1)-10(-5) mol L(-1) BaCl2浓度范围内，它呈现出线性响应，能斯特斜率为每十倍浓度变化30 mV。该电极对Ba2+相对于Li+、Na+、K+、Rb+、Cs+、NH4+、Ag+、Mg2+、Ca2+、Sr2+、Mn2+、Fe2+、Co2+、Ni2+、Cu2+、Zn2+、Cd2+、Pb2+、Al3+、La3+和Ce3+离子具有高选择性。电极响应在较宽的pH范围（3 - 11）内稳定。电极寿命约为2个月。它已成功应用于一些岩石中Ba2+含量的测定。
