【摘要】 本文提出了在弱酸性条件下,以螯合树脂预浓集薄层树脂相光度法测定铜的新方法。本法灵敏度高(ε₄₃₅=3.6×10⁵L·mol^-1·cm^-1),比液相光度法提高33倍;选择性好,大多数共存离子不影响测定;方法的检出限为5.3μg·L^-1,RSD为1.67％（n=6）。对水样和高纯稀土试样中的痕量铜进行了测定,结果令人满意。更多还原

【Abstract】 A method to determine Cu（Ⅱ） by DDTC chelating resin preconcentration and thin layer resin phase spectrophotometry has been developed. The method is sensitive with a apparent molar absorption of 3.6×10⁵ L·mol^-1·cm^-1, which is 33 times higher than that of liquid phase spectrophotometry. It has a good selectivity, and most coexisting ions do not influence the determination. The detection limit for Cu（Ⅱ） is 5.3 μg/L with the precision of 1.67%（n=6,30μg Cu（Ⅱ））. The calibration curve is linear in the range of 0～7.2 μg/mL. The preposed method was applied to the determination of Cu in water and high pure rare earth meterial with satisfactory results.更多还原