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以前,室温下在较低pH值范围内络合滴定Cu~(2+)、Co~(2+)、Ni~(2+)等离子是不可能的,现在利用二甲酚橙金属螯合物水溶液的热色性,使这成为可能。
Previously, it was impossible to complex titrate Cu 2+, Co 2+ and Ni 2+ ions at room temperature in the lower pH range. Now it is possible to use xylenol orange metal chelate The thermochromism of the aqueous solution makes this possible.