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The two podand chelates based on diethylsulfide, 1,5‐bis(2′‐hydroxy‐4′‐nitrophenoxy)‐3‐thiapentane (L1) and 1,5‐bis(8′‐oxybenzopyridine)‐3‐thia pentane (L2), have been synthesized and explored as neutral ionophores for preparing poly(vinyl chloride) based membrane electrodes selective to Pb2+. The addition of anionic additives and various plasticizers has been found to substantially improve the performance...
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