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ATOMIC-ABSORPTION DETERMINATION OF CHROMIUM IN TABLE SALT USING MATRIX EXTRACTION SEPARATION AND ULTRASOUND ACTION

ATOMIC-ABSORPTION DETERMINATION OF CHROMIUM IN TABLE SALT USING MATRIX EXTRACTION SEPARATION AND ULTRASOUND ACTION

Abstract

The use of ultrasound in the determination of chromium in table salt using the extraction of the macrocomponent was investigated. The method of extractive separation of the base allows determination of the chromium content in table salt without destroying organic substances. Optimal conditions for dissolving the base in hydrogen peroxide (90 %) were experimentally established: temperature – from –20 to –25 °C, ultrasound frequency 18–44 kHz, intensity 0.5–0.8 W/cm2 , action time 20–25 s, respectively. At the same time, the maximum possible solubility of sodium chloride in hydrogen peroxide is achieved - up to 42 g/100 ml. It was established that the simultaneous use of high-frequency ultrasound (1.0–2.0 MHz, 0.25–0.50 W/cm 2 ) and low-frequency ultrasound (18–100 kHz, 0.15–0.25 W/cm2) increases the solubility of sodium chloride in hydrogen peroxide from 42 to 47 g/100 ml, increase the degree of extraction of the injected part of chromium from 94–95 to 98–99 %. Methods for determining chromium content in common salt using low-frequency ultrasound, as well as simultaneous action of high- and low-frequency ultrasound with improved metrological characteristics of the results of analysis of common salt, have been developed. The use of ultrasound in the determination of chromium in table salt using the extraction of the macrocomponent was investigated. The method of extractive separation of the base allows determination of the chromium content in table salt without destroying organic substances. Optimal conditions for dissolving the base in hydrogen peroxide (90 %) were experimentally established: temperature – from –20 to –25 °C, ultrasound frequency 18–44 kHz, intensity 0.5–0.8 W/cm2 , action time 20–25 s, respectively. At the same time, the maximum possible solubility of sodium chloride in hydrogen peroxide is achieved - up to 42 g/100 ml. It was established that the simultaneous use of high-frequency ultrasound (1.0–2.0 MHz, 0.25–0.50 W/cm 2 ) and low-frequency ultrasound (18–100 kHz, 0.15–0.25 W/cm2) increases the solubility of sodium chloride in hydrogen peroxide from 42 to 47 g/100 ml, increase the degree of extraction of the injected part of chromium from 94–95 to 98–99 %. Methods for determining chromium content in common salt using low-frequency ultrasound, as well as simultaneous action of high- and low-frequency ultrasound with improved metrological characteristics of the results of analysis of common salt, have been developed.

Досліджено використання ультразвуку при визначенні Xpoму в кухонній солі з використанням екстракції макрокомпоненту. Метод екстракційного відділення основи дозволяє проводити визначення вмісту Хрому у кухонній солі без руйнування органічних речовин. Експериментально встановлені оптимальні умови розчинення основи в гідроген пероксиді (90 %): температура – від –20 дo –25 0 C, частота ультразвуку 18–44 кГц, інтенсивність 0.5–0.8 Вт/cм2, час дії – 20–25 c відпoвіднo. В цих умовах досягається максимально можлива розчинність xлopиду нaтpію в гідроген пepoкcиді – дo 42 г/100 мл. Встановлено, що використання одночасної дії ультразвуку високої частоти (1.0–2.0 МГц, 0.25–0.50 Вт/cм2 ) і ультразвуку низької частоти (18–100 кГц, 0.15–0.25 Вт/cм2 ) дозволяє підвищити розчинність хлориду натрію у пероксиді водню з 42 до 47 г/100 мл, підвищити ступінь вилучення введеної частини Xpoму з 94–95 до 98–99 %. Розроблені методики визначення вмісту Xpoму в кухонній солі з використанням ультразвуку низької частоти, а також одночасної дії ультразвуку високої та низької частот з поліпшеними метрологічними характеристиками результатів аналізу кухонної солі.

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Keywords

кухонна сіль; хром; ультразвук; пробопідготовка; атомно-абсорбційна спектроскопія; метрологічні характеристики., table salt, chromium, ultrasound, sample preparation, atomic absorption spectroscopy, metrological characteristics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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