COMPOSITION OF TEST POWDER FOR DETERMINATION OF SULFITE IONS IN AQUEOUS SOLUTIONS, AIR MEDIA AND BIOLOGICAL OBJECTS Russian patent published in 2023 - IPC G01N21/78 G01N31/22 

FIELD: analytical chemistry; soil science; ecology.

SUBSTANCE: composition of the test powder for the determination of sulfite ions in aqueous solutions, air media and biological objects is proposed, characterized by the fact that it contains 4-[(4-aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl]-2-methylaniline hydrochloride in a molar ratio of 1:1, formalin, silicon dioxide, kaolin, polylactide and linseed in the following ratio, wt.%: 4-[(4-aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl]-2-methylaniline hydrochloride in a molar ratio of 1:1 - 0.2-1.0; formalin - 0.02-0.1; silicon dioxide - 6.0-8.0; kaolin - 2.0-6.0; polylactide - 1.0-4.0; linseed - up to 100.

EFFECT: manufacturing of a composition that allows for express analysis of samples at the sampling site, as well as maintaining stability, physical and chemical characteristics for a long time while increasing the sensitivity and accuracy of determining the concentration of sulfite ions.

1 cl, 5 ex