[1] Univ Strathclyde, Dept Pure & Appl Chem, Glasgow G1 1XL, Lanark, Scotland
[2] Spectro Analyt Instruments, ZA-0227 Groenkloof, South Africa
[3] Polytech Inst, Dept Analyt Chem, SU-195251 St Petersburg, Russia
[4] UNDP, Vientiane, Laos
[5] Natl Res Council Canada, Div Chem, Ottawa, ON K1A 0R9, Canada