Determining the available phosphorus in soil by spectrophotometry using bromophenol blue as acid-base indicator (CAT#: STEM-PPA-0028-LJX)

Introduction

The standard method and general method for determining available phosphorus in soil are usually used to extract samples with acid or alkali solution, adjust the pH value of the extract solution, and then determine by spectrophotometry. The filtration operation of this method is complicated, and the color of acid-base indicator dinitrophenol is easily disturbed by the background color of solution and is toxic. This service adopts centrifugal separation instead of filtration, and uses bromophenol blue as an indicator to adjust pH. The color mutation is more obvious, which is not easily affected by the background color of the liquid to be tested, and has low toxicity and accurate test data.