On some condition, tannin and gallium can form chelate complex, which is stable and can be adsorbed by solid sorbent, e.g. active carbon.

• 研究发现在一定的实验条件下，单宁和镓生成有色的单宁-镓络合物，此络合物稳定，可以被活性碳等固体吸附剂吸附。