Title:
METHOD FOR DETECTING LEAD PRESENT IN SPECIMEN
Document Type and Number:
WIPO Patent Application WO/2010/050026
Kind Code:
A1
Abstract:
In a method for detecting lead using rhodizonic acid, even in the case where Sn is present in a specimen, pink or red coloration by reaction of lead with rhodizonic acid is made clearly observable. To cope with it, an acidic aqueous solution in which hydrogen peroxide coexists or a buffer thereof (for example, tartaric acid) is used as a reagent. The hydrogen peroxide oxidizes Sn2+ to Sn4+. Sn4+ does not react with rhodizonic acid, therefore, the existence of Sn does not hinder the visual observation of pink or red coloration by reaction of lead with rhodizonic acid.
Inventors:
KAYANO KENGO (JP)
SATO NAOKI (JP)
HIRAYAMA SHINICHIRO (JP)
SATO NAOKI (JP)
HIRAYAMA SHINICHIRO (JP)
Application Number:
PCT/JP2008/069748
Publication Date:
May 06, 2010
Filing Date:
October 30, 2008
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
KAYANO KENGO (JP)
SATO NAOKI (JP)
HIRAYAMA SHINICHIRO (JP)
KAYANO KENGO (JP)
SATO NAOKI (JP)
HIRAYAMA SHINICHIRO (JP)
International Classes:
G01N31/00
Foreign References:
| JP2002511929A | 2002-04-16 | |||
| JP2008504963A | 2008-02-21 |
Other References:
GOULD, J.H. ET AL.: "A quick color test to detect lead release from glazed ceramic and enameled metalware", ANAL. LETT., vol. 21, no. 11, 1988, pages 2145 - 2154
BEALE, A.M. ET AL.: "A rapid lead test: Public outreach and testing to detect leachable lead in ceramic ware", ARCH.ENVIRON.CONTAM.TOXICOL., vol. 20, 1991, pages 423 - 426
WEISZ, H. ET AL.: "Variations of the segment technique in the ring oven method", MIKROCHIM. ACTA, vol. 2, no. 3-4, 1982, pages 289 - 295
JUNGREIS, E. ET AL.: "A simple direct estimation of ultramicroquantities of lead in drinking water using sodium rhodizonate", MICROCHEM.J., vol. 34, no. 2, 1986, pages 219 - 221
PREER, J.R. ET AL.: "A simplified method for detection of lead contamination of soil", ENVIRON. POLLUT. SER. B, vol. 12, no. 1, 1986, pages 1 - 13
BEALE, A.M. ET AL.: "A rapid lead test: Public outreach and testing to detect leachable lead in ceramic ware", ARCH.ENVIRON.CONTAM.TOXICOL., vol. 20, 1991, pages 423 - 426
WEISZ, H. ET AL.: "Variations of the segment technique in the ring oven method", MIKROCHIM. ACTA, vol. 2, no. 3-4, 1982, pages 289 - 295
JUNGREIS, E. ET AL.: "A simple direct estimation of ultramicroquantities of lead in drinking water using sodium rhodizonate", MICROCHEM.J., vol. 34, no. 2, 1986, pages 219 - 221
PREER, J.R. ET AL.: "A simplified method for detection of lead contamination of soil", ENVIRON. POLLUT. SER. B, vol. 12, no. 1, 1986, pages 1 - 13
Attorney, Agent or Firm:
HIRAKI, Yusuke et al. (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
Download PDF: