Acid Sulfate Management Plan · MCU16/0103

                                                                                                                              BE018333 R0
                                           METHOD SUMMARY



      METHOD         METHODOLOGY SUMMARY

     AN020         Unpreserved water sample is filtered through a 0.45µm membrane filter and acidified with nitric acid similar to
                   APHA3030B.



     AN135         Alkalinity (and forms of) by Titration: The sample is titrated with standard acid to pH 8.3 ( P titre) and pH 4.5 (T titre)
                   and permanent and/or total alkalinity calculated. The results are expressed as equivalents of calcium carbonate or
                   recalculated as bicarbonate, carbonate and hydroxide. Reference APHA 2320. Internal Reference AN135



     AN274         Chloride by Aquakem DA: Chloride reacts with mercuric thiocyanate forming a mercuric chloride complex. In the
                   presence of ferric iron, highly coloured ferric thiocyanate is formed which is proportional to the chloride
                   concentration. Reference APHA 4500Cl-



     AN275         sulfate by Aquakem DA: sulfate is precipitated in an acidic medium with barium chloride. The resulting turbidity is
                   measured photometrically at 405nm and compared with standard calibration solutions to determine the sulfate
                   concentration in the sample. Reference APHA 4500-SO42-. Internal reference AN275.



     AN318         Determination of elements at trace level in waters by ICP-MS technique, in accordance with USEPA 6020A.



     AN320/AN321   Metals by ICP-OES: Samples are preserved with 10% nitric acid for a wide range of metals and some non-metals.
                   This solution is measured by Inductively Coupled Plasma. Solutions are aspirated into an argon plasma at
                   8000-10000K and emit characteristic energy or light as a result of electron transitions through unique energy
                   levels. The emitted light is focused onto a diffraction grating where it is separated into components .

     AN320/AN321   Photomultipliers or CCDs are used to measure the light intensity at specific wavelengths. This intensity is directly
                   proportional to concentration. Corrections are required to compensate for spectral overlap between elements.
                   Reference APHA 3120 B.



     Calculation   Free and Total Carbon Dioxide may be calculated using alkalinity forms only when the samples TDS is <500mg/L.
                   If TDS is >500mg/L free or total carbon dioxide cannot be reported . APHA4500CO2 D.




21-October-2016                                                                                                                                  Page 4 of 5