摘要
本文以乙基紫-BF_4^-为电活性物质,制备碳棒涂膜式PVC膜BF_4^-离子选择电极。最佳膜组成:电活性物质5mg,邻苯二甲酸二丁酯(DBP)0.4ml,PVC粉0.20g.测量介质0.1mol/L Na_2SO_4,pH范围3-11。线性响应范围2.8×10^(-1)～3.2×10^(-6)mol/L,检测限1.8×10(-6)mol/L,级差56±1mV/ΔlgC(20℃)。电极性能优良,成本低廉,制作容易,使用贮存方便。经批量卤水样分析证实,此法简单、快速、准确,值得推广应用。
A tetrafluoroborate ion (BF4-) selective electrode prepared by coating a graphite rod with a PVC membrane has been made and investigated. The optimum membrane composition is Ethyl Violet-BFl 5mg, dibutyl phtha-late 0.4 ml and PVC 0.20 g. The electrode exhibits Nernstian response to BFr over the concentration range 2.8×10-1-3.2×10-8mol/l. The detection limit is 1.8×10-6mol/l and the slope of the electrode response is 56±1 mV /Δ1gC. The membrane potential is independent of pH 3-11, and the membrane resistance is 0.65Ω . The coefficient of selectivity for various an-ioas were examined, only MnO4-, CIO4-, SCN-, A1F4- showed remarkble interference.The electrode showed high stability and reproclucibility. The electrode is easy to make and store, is simple to construct, and is inexpensive. It has-been used to determine boron in bittern without any chemical separation.
出处
《岩矿测试》
CAS
CSCD
北大核心
1989年第4期307-310,共4页
Rock and Mineral Analysis
