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本文提出了一种铜的微量测定法——离子交换剂比色法。卟啉α,β,γ,δ-四(4-N-甲基吡啶)卟吩[T(4-MPy)P]作为显色剂。在pH4.5和40℃下Cu~(2+)和T(4-MPY)P络合后,加入硫酸,剩余的T(4-MPy)P转变为质子化形式H~+-T(4-MPy)P。络合物和H~+-T(4-MPy)P容易地吸着在阳离子交换树脂Dowex50 W-X 2-H~+(100～200目)上。测定424 nm处络合物形式在树脂相的吸收度和510 nm处树脂背景的吸收度。可能存在于各种天然水中的外来离子(最高可达铜离子浓度的1,000倍)均无干扰。对于1升试样来说,检测限为0.072μg/l。可以测定各种天然水中μg/l级或更低含量的铜。
This paper presents a trace determination of copper - ion exchange colorimetry. Porphyrin α, β, γ, δ-tetrakis (4-N-methylpyridine) porphine [T (4-MPy) P] After the complexation of Cu 2+ with T (4-MPY) P at pH 4.5 and 40 ° C, sulfuric acid is added and the remaining T (4-MPy) P is converted to protonated form H ~ + -T (4 -MPy) P. The complex and H ~ + -T (4-MPy) P adsorbed easily on the cation exchange resin Dowex 50 W-X 2-H ~ + (100-200 mesh). The absorbance of the complex phase at 424 nm and the resin background absorbance at 510 nm were determined. Foreign ions (up to 1,000 times the copper ion concentration) that may exist in various natural waters have no interference. The detection limit was 0.072 μg / l for 1 liter of sample. Copper can be measured in μg / l or lower for various natural waters.