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From:
Published online 2012 May 27. doi: 10.1155/2012/173819

Table 1

Sequential extraction procedure for fractional determination of metallic elements.

StepFractionExtraction reagentsRatio of sludge : reagentExtraction condition
1F1Extrapure water7 : 70Shake 6 h, 30°C
2F20.05 mol·dm−3 Ca(NO3)27 : 70Shake 24 h, 30°C
3F32.5% CH3COOH7 : 70Shake 24 h, 30°C
4F46% H2O27 : 120Water bath, 95°C (Evaporate)
2.5% CH3COOH7 : 70Shake 24 h, 30°C
5F50.1 mol·dm−3 (COOH)2 + 0.175 mol·dm−3 (COONH4)2 + Ascorbic acid7 : 210Water bath, 6 h, 95°C
Occasional shaking
6F6HNO3 + HFMicrowave digestion