Abstrak
<div><p>Research of study copresipitation Zn<sup>2+</sup> using Al(OH)<sub>3</sub> as coprecipitant has been done. This study aims to determine the optimum conditions for coprecipitation of Zn<sup>2+</sup> by Al(OH)<sub>3</sub>, and influence of foreign ions. This study uses variation pH about 5,0 – 10,0; variation of eluent volume about 8,0 – 14,0; variation of concentrated HNO<sub>3</sub> volume about 1,0 – 5,0; and variation of concentration Cu<sup>2+</sup> about 0,8; 1,2; 1,6; 2,0 and 2,4. Measurement concentration of Zn<sup>2+</sup> using Atomic Absorption Spectroscopy (AAS) with wavelength of 213,9 nm. The result showed the optimum conditions occur at pH about 8, 12 mL of eluent and 1 mL of concentrated HNO<sub>3</sub> with the absorption capacity of 0,074 mg/g. Meanwhile, the presence of foreign ions such as Cu<sup>2+</sup> has influenced the coprecipitated Zn where concentration of the coprecipitated Zn decreased with increasing the concentration of foreign ions.</p><p>Keywords: coprecipitation, coprecipitant Al(OH)<sub>3</sub>, trace metal, Zn, AAS</p><div> </div></div>