Analytical Sciences

Simultaneous Determination of Trimethyl-and Triethyllead in Urban Dust by Species-specific Isotope Dilution/Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry

Tomoki YABUTANI,* Junko MOTONAKA,* Kazumi INAGAKI,** Akiko TAKATSU,** Takashi YARITA,** and Koichi CHIBA**

*Institute of Science and Technology, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
**National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan

Both ²⁰⁶Pb-labeled trimethyllead (TML) and triethyllead (TEL) were synthesized from ²⁰⁶Pb-enriched metallic Pb certified reference material (NIST SRM 983) and iodomethane or iodoethane through a one-process reaction in a closed system using centrifuge tubes, respectively. Organolead compounds in an urban dust reference material (BCR CRM 605) were extracted with an acetic acid/methanol (1:1) solution, which was mechanically shaken for 24 h. After adjusting the pH of the extracted solution to pH 5, the extracted organolead compounds were derivatized by tetrabutylammonium tetrabutylborate (TATB) and measured with GC-ICPMS. The analytical results of TML and TEL for BCR CRM 605 were 8.22 ± 0.04 µg kg^-1 (mean ± standard deviation, n = 3) and 1.12 ± 0.06 µg kg^-1, respectively. The analytical results of TML agreed well with the certified value (7.9 ± 1.2 µg kg^-1).

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