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2004•Journal of Yunnan University for NationalitesRequires access

Synthesis of QADAB and spectrophotometric determination of Copper (II) by the solid phase extraction

WU Fang-ping

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Abstract

Based on synthesis of 2-(2-quinolinylazo)-1,3-diaminobenzene (QADAB),the color reaction of QADAB with copper(Ⅱ) and the solid phase extraction of its colored complex with Waters Porapak~ Sep-Pak-C18 cartridge, a new method for the determination trace of copper(Ⅱ) was studied. In the medium of CTMAB and the presence of pH=4.0 KH_2PO_4-K_2HPO_4 buffer solution. QADAB can reacts with copper (II) to form a stable 2∶1 complex. The colored complex can be extracted by C_(18) cartridge and eluted by ethanol, then can be determined by spectrophotometry. The molar absorptivity of the complex is 8.08×10~4*!L·mol~(-1)·cm~(-1) at 555*!nm. Beer's law is obeyed in range of 0～1.0*!μg/mL. This method can be applied to the determination of copper in water with good results.

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Based on synthesis of 2-(2-quinolinylazo)-1,3-diaminobenzene (QADAB),the color reaction of QADAB with copper(Ⅱ) and the solid phase extraction of its colored complex with Waters Porapak~ Sep-Pak-C18 cartridge, a new method for the determination trace of copper(Ⅱ) was studied. In the medium of CTMAB and the presence of pH=4.0 KH_2PO_4-K_2HPO_4 buffer solution. QADAB can reacts with copper (II) to form a stable 2∶1 complex. The colored complex can be extracted by C_(18) cartridge and eluted by ethanol, then can be determined by spectrophotometry. The molar absorptivity of the complex is 8.08×10~4*!L·mol~(-1)·cm~(-1) at 555*!nm. Beer's law is obeyed in range of 0～1.0*!μg/mL. This method can be applied to the determination of copper in water with good results.

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Available abstract

Based on synthesis of 2-(2-quinolinylazo)-1,3-diaminobenzene (QADAB),the color reaction of QADAB with copper(Ⅱ) and the solid phase extraction of its colored complex with Waters Porapak~ Sep-Pak-C18 cartridge, a new method for the determination trace of copper(Ⅱ) was studied. In the medium of CTMAB and the presence of pH=4.0 KH_2PO_4-K_2HPO_4 buffer solution. QADAB can reacts with copper (II) to form a stable 2∶1 complex. The colored complex can be extracted by C_(18) cartridge and eluted by ethanol, then can be determined by spectrophotometry. The molar absorptivity of the complex is 8.08×10~4*!L·mol~(-1)·cm~(-1) at 555*!nm. Beer's law is obeyed in range of 0～1.0*!μg/mL. This method can be applied to the determination of copper in water with good results.

Key concepts: Copper, Molar absorptivity, Chemistry, Spectrophotometry, Solid phase extraction, Extraction (chemistry), Color reaction, Elution

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