Preconcentration of Cu(II)-nitrosonaphtholdisulfonate complex on the chitin/metal-furnace AAS.

MINAMISAWA Hiroaki, ARAI Nobumasa, OKUTANI Tadao

doi:10.2116/bunsekikagaku.42.11_767

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銅（ＩＩ）‐ニトロソナフトールジスルホン酸塩錯体のキチンへの吸着濃縮／メタル炉原子吸光分析
ドウ 2 ニトロソナフトールジスルホンサンエンサクタイノキチンエノ
銅(II)-ニトロソナフトールジスルホン酸塩錯体のキチンへの吸着濃縮 : メタル炉原子吸光分析(<特集>:分離(その1))(予備濃縮分離)

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Abstract

Copper(II) is adsorbed as its anionic complex with 1-nitroso-2-naphthol-3, 6-disulfonic acid disodium salt (Nitroso R salt, NR) on chitin, because chitin is protonated in an acidic medium, and acts as an anion adsorbent. A simple and rapid determination method of trace amounts of Cu(II) by metal-furnace AAS using direct heating of metal-adsorbed chitin was thus investigated. The obtained method is as follows. To 1001000 cm³ of a sample solution containing less than 0.5 μg of Cu(II), add 2.0 cm³ of 10^-2 mol dm ^-3 NR solution and 50 mg of chitin. The pH is then adjusted to 4.0 using dilute ammonia water and nitric acid. The chitin which adsorbs the Cu · NR is separated from the sample solution by filtration. The chitin on the filter paper is dispersed in 5.0 cm³ of water. After shaking, 10 μl of the suspension is directly injected into the tungsten matal-furnace. The absorbance is measured at 324.7 nm by metal-furnace AAS. The calibration curve was liner below 0.5 μgCu(II)/100 cm³ (aqueous phase). The relative standard deviations (n = 8) were 4.2% for 0.3 μgCu(II)/100 cm³, 4.8% for 0.1 μgCu (11)/100 cm³. The determination limits (S / N ≥3) were 0.03 μgCu(II)/100 cm³ (0.3 ppb). The proposed method was applied to the determination of Cu(II) in several water samples. The adsorption isotherm of Cu·NR on the chitin was found to be fitted by the Freundlich equation.

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 42 (11), 767-771, 1993

The Japan Society for Analytical Chemistry

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