三氮烯试剂析相光度法测定痕量铜的研究

摘要

研究了三氮烯试剂－铜－OP乳化剂析相富集体系在 Na2B4O7－NaOH(pH10.2)介质中，于90±1℃加热胶束溶液，保 持45min，络合物即被OP乳化剂完全富集。富集液在520nm处测定吸光度， 铜含量在0～3.0μg／50mL范围内服从比尔定律，该法与一般光度法 相比，灵敏度高，选择性好。用于铝合金样中铜的测定，结果满意。%A study on the phase separation system of triazene-copper-OP emulsifying agent was carried out. In the medium of Na2B4O7-NaOH buffer at pH 10.2, the complex of triazene-copper could be enriched in the phase of OP emulsifying agent, when heating at 90±1℃ for 45min in a boilling water bath. The absorption was measured at 530nm and Beer's law was obeyed in the range of 0～3.0μg Cu2+/50mL. The method was characteristic of high sensitivity and selectivity compared with that ordinary spectrophotometry. The method has been applied to determine trace copper in aluminium alloy with satisfactory results.