TY - BOOK T1 - Automated, colorimetric methods for determination of nitrate plus nitrite, nitrite, ammonium and orthophosphate ions in natural water samples DA - 1996. CY - Denver, Colo. : AU - Antweiler, Ronald C. AU - Patton, Charles J. AU - Taylor, Howard E. VL - 93-638 CN - I 19.76: PB - U.S. Geological Survey : PB - Books and Open-File Reports Section [distributor], PP - Denver, Colo. : PY - 1996. ID - 219556 KW - Water KW - Water KW - Colorimetric analysis. TI - Automated, colorimetric methods for determination of nitrate plus nitrite, nitrite, ammonium and orthophosphate ions in natural water samples ER -