An overvie An overvie ew of approved ew of approved methods and - PowerPoint PPT Presentation

An overvie An overvie ew of approved ew of approved methods and candidate method d capabilities Wi lliam Lipps OI Analytical Char rles J. Patton U.S. Ge eological Survey National Wate er Quality Laboratory

Nitrite 353.2 (RSD) Nitrate+N

real MDL real MDL "EPA meth "EPA meth (mg/L MDL (mg Parameter Parameter 0.08 0.01 Ammonia as N Ammonia as N 0.03 0.01 Nitrate-nitrite as N 0.023 0.01 Orthophosphate as P P 0.023 0.01 Total Phosphorus 0.4 0.01 Total Kjeldahl-Nitroge en

or something new? Isn t it time fo

Waveguides Ammonia with 2 m pat and Berthelot reaction d B h l i • MDL = 0.07 ppb MDL 0 07 b • 40 X decrease

Diffusion Diffusion Condu uctivity for Ammonia y Simple, accur rate, small sample volumes MDL = 1 ppb

Fluoro ometric Ammonia LED Source LED Source M MDL ~ 0.3 ppb

MDL = 3 x decrease for Nitrite

of ph hosphorus 100 X concentration 100 X concentration factor

Photo Credit: Peter Rejcek Cont tamination of: Reagents g Samp pling apparatus Water

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