Showing papers on "Color reaction published in 2021"
01 May 2021
TL;DR: In this article, a rapid and accurate method for the determination of available phosphorus in alkaline soil by molybdenum blue spectrophotometry was established, which is simple, sensitive and accurate.
Abstract: A rapid and accurate method for the determination of available phosphorus in alkaline soil by molybdenum blue spectrophotometry was established. The alkaline soil samples were extracted by Olsen method. The effects of absorption wavelength, amount of chromogenic agent, amount of reducing agent and colour reaction time on the determination results were investigated. The results showed that the optimal conditions were as follows: the maximum absorption wavelength was 700 nm, the amount of chromogenic agent was 1 mL, the amount of reducing agent was 1 mL, and the colour reaction time was 15 min. The linear range of phosphorus concentration was 0.3 μg/mL ~ 1.8 μg/mL, and the recoveries ranged from 88.67 % to 92.17 %. The method is simple, sensitive and accurate.
8 citations
TL;DR: In this article, a procedure for determining iron in various water samples employing molecular absorption spectrophotometry was proposed, where ligands used are 1-Nitroso-2-naphthol-3,6-disulphonic acid disodium salt and Hexadecyl trimethyl ammonium Bromide.
3 citations
TL;DR: In this paper, the synthesis of a thiocarbazone for the selective determination of Cu2+ in distilled beverages was described, and a method was based on the complexation reaction of the Cu2 + with the Thiocarbazone, and the colored product was analyzed using a smartphone application.
2 citations