The results of IR analysis showed that the formation of ionic bond was the major interaction mechanism between bentazone and humic acid HA1, which containing more carboxyl groups.

• 结果表明,苯达松与腐植酸作用时,因腐植酸所含官能团种类、数量不同,形成不同的吸附机理。含有羧基较多的腐植酸HA_1,易与苯达松形成离子键,氢键是其可能的吸附机理;