2007•Anhui nongye kexueRequires access
Straightly Extracting and Rapidly Determining Humic acid Level of Purple Soil by Colorimetry
Yanhong Feng
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Abstract
This text uses the colorimetry to determine humic acid in purple soil extracted by ASI and pH 8.5,0.5 mol/L NaHCO3,comparing the results with humic acid extracted by 0.1 mol/l Na4P2O7-0.1 mol/l NaOH.It shows the correlation coefficients of humic acid are 0.976 and 0.914(n=8),and they are best correlative.Synchronously;humic acid extracted by ASI and NaHCO3 apartly are 22.4%and 9.16% of humic acid extracted by Na4P2O7.Comparing the results with organic matter extracted by conventional method,it can be found out R=0.920、0.889(n=8).Thus two methods can both reflect humic acid level in purple soil.