Determination of Cr and Ni in seawater by high-resolution electrothermal atomic absorption spectrometry with a continuous spectrum source

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Abstract

Разработаны условия определения Ni и Cr в морской воде методом электротермической атомно-абсорбционной спектрометрии высокого разрешения с источником сплошного спектра (ВР-ИСС ЭТААС). Азотная кислота использована в качестве химического модификатора. Проведено сравнение аналитических возможностей данного варианта метода с вариантом электротермической атомно-абсорбционной спектрометрии низкого разрешения с линейчатыми источниками излучения (НР-СИС ЭТААС) и дейтериевой коррекцией фона. Градуировочная зависимость построена по стандартным растворам аналитов. Методики определения Cr и Ni апробированы на образцах воды Черного моря по методу введено−найдено. С использованием варианта ВР-ИСС ЭТААС достигнуты пределы обнаружения (мкг/л): 0.12 для Cr и 0.09 для Ni (дозировка 80 мкл). Для метода НР-СИС ЭТААС эти показатели хуже: 0.6 мкг/л (Cr) и 1 мкг/л (Ni) при дозируемом объеме пробы морской воды 10 мкл. Показана возможность применения метода ЭТААС для прямого определения содержаний Cr и Ni в морской воде на уровне на два порядка ниже предельно допустимых концентраций. 

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About the authors

M. Yu. Burylin

Кубанский государственный университет

Email: kopeikoelena@yandex.ru
Russian Federation, ул. Ставропольская, 149, Краснодар, 350040

E. S. Kopeyko

Кубанский государственный университет

Author for correspondence.
Email: kopeikoelena@yandex.ru
Russian Federation, ул. Ставропольская, 149, Краснодар, 350040

E. S. Kostyuchenko

Кубанский государственный университет

Email: kopeikoelena@yandex.ru
Russian Federation, ул. Ставропольская, 149, Краснодар, 350040

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Supplementary files

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2. Fig. 1. Dependences of the analytical signals Ni (α) and Cr (■) on the temperature of the pyrolysis and atomization stages: (a) absorption, (b) integral absorption.

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3. Fig. 2. Analytical signals Ni (a) and Cr (b) in the presence of seawater (dosage 10 µl): absorption (red) and background signal (blue).

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4. Fig. 3. Analytical signal of nickel: (a), (c) – standard solution with a concentration of 10 micrograms / l; (b), (d) – sea water with an addition of 10 micrograms/l of analyte; dosage 20 micrograms. Absorption (red) and background signal (blue).

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5. Fig. 4. The analytical signal of chromium: (a), (c) – a standard solution with a concentration of 10 micrograms / l; (b), (d) – seawater with the addition of 10 micrograms / l of analyte; dosage 10 micrograms. Absorption (red) and background signal (blue).

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6. Fig. 5. Analytical signals of nickel ((a) – standard solution with a concentration of 50 mcg/l, tpir = 1000 oC; (b) – seawater with an addition of 50 mcg/l analyte, tpir = 1000 OC; (c) – seawater with an addition of 50 mcg/l, tpir = 1200 OC) and chromium ((g) – a standard solution with a concentration of 5 mcg/l, tpir = 1300 oC; (e) – seawater with an addition of 5 mcg/l analyte, tpir = 1300 OC; (e) – seawater with an addition of 5 mcg/l analyte, tpir = 1400 oS; (g) – a standard solution with a concentration of 5 micrograms / l, tpir = 1400 OC): absorption (red) and background signal (blue), dosage is always 10 µl.

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