The main reason is the binding sites on the humic acid and metal ions' competition for them. However, along with ionic strength increasing, the complexation capacity was decreased.
溶液中铜离子浓度及腐殖酸浓度的增加会使络合率呈现上升的趋势，这主要与腐殖酸溶液提供的络合点位及金属离子对络合点位的竞争有关。
The main reason is the binding sites on the humic acid and metal ions' competition for them. However, along with ionic strength increasing, the complexation capacity was decreased.
溶液中铜离子浓度及腐殖酸浓度的增加会使络合率呈现上升的趋势，这主要与腐殖酸溶液提供的络合点位及金属离子对络合点位的竞争有关。
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