[1] US EPA, MONITORING & SUPPORT LAB, CINCINNATI, OH 45268 USA
[2] MISSISSIPPI STATE CHEM LAB, MISSISSIPPI STATE, MS 39762 USA
[3] WISCONSIN DEPT AGR TRADE & CONSUMER PROTECT, BUR LAB SERV, MADISON, WI 53707 USA
[4] ENVIRONM CANADA, NATL WATER RES INST, RES & APPLICAT BRANCH, BURLINGTON L7R 4A6, ONTARIO, CANADA
[5] CHEM WASTE MANAGEMENT INC, RIVERDALE, IL 60627 USA
[6] LOCKHEED ENGN & SCI CO, LAS VEGAS, NV 89119 USA
[7] US EPA, OFF SOLID WASTE, WASHINGTON, DC 20460 USA
[8] USA, CORPS ENGINEERS, WATERWAYS EXPT STN, ANALYT LAB, VICKSBURG, MS 39180 USA