ยูวีวิสิเบิลสเปกโทรโฟโตเมทรีสำหรับตรวจวัดไอออนโลหะประจุ +2 โดยใช้คัฟเฟอรอน (UV-VISBLE SPECTROPHOTOMETRY FOR DETERMINATION OF 2 CHARGED METAL IONS USING CUPFERRON)

Abstract

           The indirect determinations of metal ions with +2 charge using UV-Vis spectrophotometric method were studied via the chelating with cupferron. The complexation between metals ions (Cu²⁺, Pb²⁺, Zn²⁺ and Cd²⁺) and cupferron were formed in this work. The mole ratio between ligand and metal ions for 1:1 was found to be optimal at pH 4.4 of phosphate buffer. The duration time of complexation as 10 min was suitable to form a chelating compound.  The wavelength between 200-500 nm was used for determination of metal ions except for Cd²⁺ that could not be detected. The limit of detection (LOD) were found as 0.03 , 0.02 and 0.01 mg/L for Cu²⁺, Pb²⁺ and Zn²⁺, respectively. The limit of quantitation (LOQ) for Cu²⁺, Pb²⁺ and Zn²⁺ were presented serially in 0.12, 0.10 and 0.07 mg/L. The recovery of Cu²⁺, Pb²⁺ and Zn²⁺ were 100.31, 98.09 and 103.43%, respectively. The precision in term of %RSD were found respectively as 8.54, 6.78 and 8.25 for Cu²⁺, Pb²⁺ and Zn²⁺.