SEPARATION AND PRECONCENTRATION OF COPPER (II) ION BY FATTY HYDROXAMIC ACIDS IMMOBILIZED ONTO AMBERLITE XAD – 4 RESIN - Suhendra, Dedy; Department of Chemistry, FKIP Universitas Mataram, Jl. Majapahit no. 62 Mataram, NTB (Universitas Gadjah Mada, 2010)