Revision History for T&M 5-B8
Charles J. Patton and Jennifer R. Kryskalla
Colorimetric Determination of Nitrate Plus Nitrite in Water by Enzymatic Reduction, Automated Discrete
Analyzer Methods
Posted online January 12, 2012
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Revised and reposted January 30, 2013
On page 3, table 1, line 3, Nitrate+ nitrite, as N, colorimetry, DA, enzymatic reduction-diazotization,
filtered acidified (method 1-2547-11), the laboratory value of 1990 was corrected to 3222.
On page 30, table 24, footnote 2 was changed to read, "Pcalc is the probability that population
distributions of nitrate+ nitrite concentrations determined by the Cd R- and YNaR1-reduction methods
are the same on the basis of the paired-sample, Wilcoxon signed-rank test. The difference between
population distributions is significant at the 95 percent confidence level (P0.05) when Pcalc is less than 0.05
and at the 99 percent confidence level (P0.01) when Pcalc is less than 0.01.