Reagents and SolutionsAll solutions

Reagents and Solutions

All solutions were prepared with distilled and deionized water (Milli-Q Plus, Millipore, Barueri, São Paulo, Brazil). The calibration solutions were prepared after successive dilutions of the stock standard solutions (Merck, Darmstadt, Germany). For Fe and Zn, the concentrations varied from 0.25 to 8 and from 0.2 to 1.5 mg/L, respectively. Due to the expected low Cd and Pb concentrations, the calibration solutions varied from 5 to 25 and from 100 to 500 μg/L, respectively.

Procedure for Metal Extraction

In order to reduce the sample preparation procedures time, an extraction method was studied. In this case, a simple procedure mixing the sample with diluted acids was proposed. In order to maximize the optimization of this extraction a fractional factorial design (Bruns et al. 2006) was developed

Results (Indonesian) 2:

Reagen dan Solusi

Semua solusi disiapkan dengan suling dan air deionisasi (Milli-Q Plus, Millipore, Barueri, São Paulo, Brazil). Solusi kalibrasi disusun setelah pengenceran berturut solusi standar saham (Merck, Darmstadt, Jerman). Untuk Fe dan Zn, konsentrasi bervariasi 0,25-8 dan 0,2-1,5 mg / L, masing-masing. Karena konsentrasi Cd dan Pb rendah yang diharapkan, solusi kalibrasi bervariasi dari 5 sampai 25 dan 100-500 mg / L, masing-masing.

Prosedur Logam Ekstraksi

Dalam rangka mengurangi sampel waktu prosedur persiapan, metode ekstraksi dipelajari. Dalam hal ini, prosedur sederhana mencampur sampel dengan asam diencerkan diusulkan. Untuk memaksimalkan optimasi ekstraksi ini desain faktorial pecahan (Bruns et al. 2006) dikembangkan