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1,2,4‐Triazine‐Based Chromogenic Reagents for the Detection of Microtraces of Various Metals Left on Human Skin *
Author(s) -
Olejniczak Andrzej,
Cyganiuk Aleksandra W.,
Lukaszewicz Jerzy P.
Publication year - 2010
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/j.1556-4029.2010.01350.x
Subject(s) - chromogenic , reagent , metal ions in aqueous solution , brass , chromatic scale , zinc , metal , chemistry , materials science , metallurgy , copper , nuclear chemistry , chromatography , optics , organic chemistry , physics
This article extends the application of 1,2,4‐triazine‐based chromogenic reagents to the detection of nonferrous metal traces left on contact with canvas and human skin. The possibility of detection of iron traces resulting from contact with objects made of stainless steel was investigated as well. Additionally, the ability of triazines to form chromatic complexes with Zn 2+ , Ni 2+ , Co 2+ , Cu 2+ , Cr 3+ , and Al 3+ ions was studied spectrophotometrically. Molar absorption coefficients, ranging from 8.8 to 29.9 × 10 3 /M/cm, provide high sensitivity of 1,2,4‐triazines toward nonferrous ions, thus, enabling the detection at concentrations as low as a few μM. The method was sensitive enough to detect traces resulting from a 1‐min contact with a stainless steel made object, which is commonly considered as a corrosion‐resistant material. The amounts of metal ions transferred to the skin after a 2‐min contact with objects made of brass, zinc, and copper were sufficient to develop chromatic imprints.