Determination of Sub-Part-per-Trillion Amounts of Cobalt by Extraction and Photoacoustic Spectroscopy

Takehiko Kitamori; Kazumichi Suzuki; Kenji Motojima; Tsuguo Sawada; Yohichi Gohshi

doi:10.1021/ac00124a034

Determination of Sub-Part-per-Trillion Amounts of Cobalt by Extraction and Photoacoustic Spectroscopy

Takehiko Kitamori, Kazumichi Suzuki, Kenji Motojima, Tsuguo Sawada, Yohichi Gohshi

Radiation Physics

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Ultratrace amounts of cobalt at parts-per-trilllon (ppt) levels were extracted Into m-xylene from aqueous solution as nitrosonaphthol chelates, and colorimetric determination of the m-xylene phase was carried out with photoacoustic spectroscopy (PAS). Coexistent metals and excessive reagents were completely eliminated by acidic and alkaline washings of the m-xylene phase, and the background level became constant and low enough for ultrasensitive PAS determination. Concentrations of foreign heavy metals, such as Iron, nickel, chromium, and copper, 10⁵times more than cobalt caused no Interference. The determination limit was obtained as 0.64 ppt based on twice the standard deviation. The reagent 2-nitroso-1-naphthol was more suitable than 1-nltroso-2-naphthol from the viewpoint of stability.

Original language	English (US)
Pages (from-to)	2275-2278
Number of pages	4
Journal	Analytical Chemistry
Volume	58
Issue number	11
DOIs	https://doi.org/10.1021/ac00124a034
State	Published - Sep 1 1986

ASJC Scopus subject areas

Analytical Chemistry

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10.1021/ac00124a034

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title = "Determination of Sub-Part-per-Trillion Amounts of Cobalt by Extraction and Photoacoustic Spectroscopy",

abstract = "Ultratrace amounts of cobalt at parts-per-trilllon (ppt) levels were extracted Into m-xylene from aqueous solution as nitrosonaphthol chelates, and colorimetric determination of the m-xylene phase was carried out with photoacoustic spectroscopy (PAS). Coexistent metals and excessive reagents were completely eliminated by acidic and alkaline washings of the m-xylene phase, and the background level became constant and low enough for ultrasensitive PAS determination. Concentrations of foreign heavy metals, such as Iron, nickel, chromium, and copper, 105times more than cobalt caused no Interference. The determination limit was obtained as 0.64 ppt based on twice the standard deviation. The reagent 2-nitroso-1-naphthol was more suitable than 1-nltroso-2-naphthol from the viewpoint of stability.",

author = "Takehiko Kitamori and Kazumichi Suzuki and Kenji Motojima and Tsuguo Sawada and Yohichi Gohshi",

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T1 - Determination of Sub-Part-per-Trillion Amounts of Cobalt by Extraction and Photoacoustic Spectroscopy

AU - Kitamori, Takehiko

AU - Suzuki, Kazumichi

AU - Motojima, Kenji

AU - Sawada, Tsuguo

AU - Gohshi, Yohichi

PY - 1986/9/1

Y1 - 1986/9/1

N2 - Ultratrace amounts of cobalt at parts-per-trilllon (ppt) levels were extracted Into m-xylene from aqueous solution as nitrosonaphthol chelates, and colorimetric determination of the m-xylene phase was carried out with photoacoustic spectroscopy (PAS). Coexistent metals and excessive reagents were completely eliminated by acidic and alkaline washings of the m-xylene phase, and the background level became constant and low enough for ultrasensitive PAS determination. Concentrations of foreign heavy metals, such as Iron, nickel, chromium, and copper, 105times more than cobalt caused no Interference. The determination limit was obtained as 0.64 ppt based on twice the standard deviation. The reagent 2-nitroso-1-naphthol was more suitable than 1-nltroso-2-naphthol from the viewpoint of stability.

AB - Ultratrace amounts of cobalt at parts-per-trilllon (ppt) levels were extracted Into m-xylene from aqueous solution as nitrosonaphthol chelates, and colorimetric determination of the m-xylene phase was carried out with photoacoustic spectroscopy (PAS). Coexistent metals and excessive reagents were completely eliminated by acidic and alkaline washings of the m-xylene phase, and the background level became constant and low enough for ultrasensitive PAS determination. Concentrations of foreign heavy metals, such as Iron, nickel, chromium, and copper, 105times more than cobalt caused no Interference. The determination limit was obtained as 0.64 ppt based on twice the standard deviation. The reagent 2-nitroso-1-naphthol was more suitable than 1-nltroso-2-naphthol from the viewpoint of stability.

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Determination of Sub-Part-per-Trillion Amounts of Cobalt by Extraction and Photoacoustic Spectroscopy

Abstract

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