Preservation of nutrients and residue in water samples / V. Cheam ... [et al.]. : En13-5/86-178-2E-PDF

"Due to the Water Quality Laboratory centralization, the time between sample collection and sample analysis is longer than before. It therefore essential that the sample preservation techniques currently in use be thoroughly evaluated and modified where required, if the data generated by the consolidated laboratory are to be reliable. The seéond phase of the preservation studies is described in this report, dealing with 11 parameters of nutrients and residues. Eighteen regional, spiked and synthetic waters were investigated over a four month period. It was found that total nitrogen, dissolved organic carbon and residue were stable at 4°C and that total P was stable when preserved in 0.3% H2SO4. The study also confirmed that for labile parameters the commonly practiced preservation procedure of sample storage at 4°C is inadequate and that samples should be analysed as soon as possible"--Management perspective.

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