Does water quality or temperature affect SPMD sampling?
In general, water quality (salinity, alkalinity, etc.) has very little effect on SPMD sampling. Temperature is an exception because SPMD-sampling rates rise with temperature in water and fall when temperature increases in air. For example, a 16 oC change (10-26 oC) in water temperature resulted in a two- to four-fold increase in chlorinated pesticide sampling rates. Also, pH affects the amount of ionizable compounds (e.g., chlorinated phenols) sampled, and the magnitude of this effect is proportional to the increase or decrease in the neutral species.
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