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Ref. No. [UMCES] CBL 2015-008
ACT VS15-01
43
Figure 18.
Time series of pH measured by Campbell Scientific Instruments (CSI) pH sensor
deployed during the 1 month GLERL trial.
Top Panel
: Continuous pH
NBS
recordings from
instrument (blue line) and pH
Total
of adjacent grab samples determined by phenol red dye (red
circles).
Bottom Panel
: Difference in measured pH relative to reference samples (Instrument –
Dye Ref) observed during deployment. Dashed line represent offset (ca 0.13) predicted due to
difference in pH
NBS
and pH
Total
scales used by the CSI sensor and the dye reference method.