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A Modified Procedure for the Determination of Total Boron from Soil Fused with Sodium Carbonate
Author(s) -
Gupta Umesh C.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000050034x
Subject(s) - boron , reagent , chemistry , extraction (chemistry) , absorbance , sodium carbonate , nuclear chemistry , soil water , sodium , chromatography , organic chemistry , environmental science , soil science
Total boron was extracted by 6 N HCl and by 6 N H 2 SO 4 from a soil fused with Na 2 CO 3 . The amount of boron in the resulting extracts was determined directly. It was found that the H 2 SO 4 extraction of soils interfered with the absorbance of the boron carmine complex resulting in high values of boron. No interferences were encountered with the HCl extracts. Further, the resulting extracts from HCl were easily filtered. The percentage recovery of the added boron from the investigated soils, when extracted by 6 N HCl was good and the results were reproducible. Heating 6 N acid solutions for a period of 2 hr on a hot water bath at 100C resulted in no loss of boron. Carmine reagent was found to be stable for at least 18 days when stored in polyethylene bottles at room temperature.