- Spectrophotometric determination method of soil available phosphate in Lancaster extracting solution by separately adding molybden compound-bismuth subcarbonate mixed reagent and ascorbic acid

摘要

The present invention relates to a method for quantifying soil effective phosphoric acid using a spectrophotometer, and after adding a molybdenum compound-bismuth subcarbonate mixed color reagent as a color developing reagent to a solution leaching effective phosphoric acid from the soil by the Lancaster method, Powdered ascorbic acid is added by measuring with a spoon or weight, and then measured by absorbance using a spectrophotometer. Unlike conventional methods, the soil leaching solution can be easily developed without using a pipette. Although it does not affect the analytical precision, the use of molybdenum compound bismuth subcarbonate, which does not contain ammonium as a coloring reagent, can reduce the treatment cost of spent reagents. .