A COMPARISON AT SEA OF MANUAL AND AUTOANALYZER ANALYSES OF PHOSPHATE, NITRATE, AND SILICATE

S. W. HAGER, Elliot L Atlas, L. I. GORDON, A. W. MANTYLA, P. K. PARK

Research output: Contribution to journalComment/debate

22 Scopus citations

Abstract

A shipboard intercalibration of nutrient analyses performed using a Technicon Auto‐Analyzer (AA) and manually, using a Beckman model DU spectrophotometer, yielded the following relationships ( in µM): PO4(AA) = (0.985 ± 0.009) PO4(man) + (0.038 ± 0.018), R = 0.9983; NO3(AA) = (0.974 ± 0.008) NO3(man) − (0.399 ± 0.193), R = 0.9972; SiO2(AA) = (1.008 ± 0.006) SiO2(man) − (0.194 ± 0.272), R = 0.9991; where R is the correlation coefficient, and the number immediately following ± is the standard deviation. Both AA and manual methods give comparable precision, ±1%, at present and no significant systematic discrepancies exist between the two technologies for phosphate and silicate analyses. A small discrepancy was found in the nitrate work.

Original languageEnglish (US)
Pages (from-to)931-937
Number of pages7
JournalLimnology and Oceanography
Volume17
Issue number6
DOIs
StatePublished - 1972
Externally publishedYes

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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