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Ref. No. [UMCES] CBL 2015-014
ACT VS15-07
36
A cross-plot of the matched observations of EXO-pH2 and reference pH is given in
figure 17. The linear regression was not statistically significant (p=0.98, r
2
<0.01) with a slope of
-0.003 and an intercept of 8.29.
Figure 17.
MLML field response plot of the Xylem EXO-pH2 instrument compared to reference pH
Total
samples. Fine dotted line represents 1:1 correspondence, coarse dotted line represents the
correspondence predicted based on difference between pH
NBS
and pH
Total
in seawater (pH
NBS
= pH
Total
+
0.13).
A regression of pH measured by EXO-pH1 and EXO-pH2 was statistically significant
(p<0.001, r
2
=0.97) with a slope of 1.01 and intercept of 0.09 (data not shown).