Table 1- Used phosphorus extraction methods Table 1- Used phosphorus extraction methods Table 1- Used phosphorus extraction methods Table 1- Used phosphorus extraction methods Table 1- Used phosphorus extraction methods
Reference Reference Sediment: Water Extraction reagent Shaking time minute Extraction method
Olsen et al (1954) Olsen et al (1954) 1:20 0.5 M NaHCO3, pH 8.5 30 Olsen-P
Colwell (1963) Colwell (1963) 1:50 0.5 M NaHCO3, pH 8.5 960 Colwell-P
Mehlich (1984) Mehlich (1984) 1:10 0.2 M CH3CCOH +0.0015 NH4F + 0.25 M NH4NO3 +0.013 HNO3 + 0.0001 M EDTA 5 Mehlich III-P
Morgan (1941) Morgan (1941) 1:10 0.7 M NaC2H2O2+0.54 M CH3COOH, pH 4.8 30 Morgan-P
Bray and Kurtz (1954) Bray and Kurtz (1954) 1:10 0.4 M NH4F+05 M HCl 5 Bray II-P
Soltanpour and Schwab (1977) Soltanpour and Schwab (1977) 1:20 1M NH4HCO3 + 0.005 M DTPA, pH 7.6 15 AB-DTPA-P
Sharpley (1991) Sharpley (1991) 1:100 0.1 M NaOH 1020 0.1 M NaOH-P