Among many others, the cations that give strong emf interference include Cu 2+ ,Li +, K +, Pb 2+, Na +, Zn 2+, and Ca 2+. The results show that ISE membrane give selective response to the Ni 2+ ion at pH of 4,5 with response time of approximately 80 seconds. The amide compound derived from humic acid was immobilized into the membrane with composition percentage (w/w) as the following 32% of PVC, 64% of plasticizer of either, 2% of lipophilic anion, and 2% of ionophore the humic amide, respectively. The products of the reactions were observed using infra red (IR) spectrometer. This work aims at obtaining selectivity coefficient towards Ni 2+ ion. The carboxylic acid group of the humic acid was first modified to the corresponding amide and is expected to form complex with the target cation. The amide compound derived from humic acid has been applied as ionophore in ion selective electrode (ISE) measurement based on poly vinyl chloride (PVC) membrane.
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