High-frequency measurement of seawater chemistry: Flow-injection analysis of macronutrients Public Deposited

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  • We adapted a commercially available flow-injection autoanalyzer (Lachat Quik-Chem 8000) to measure seawater nitrate concentrations at a rate of nearly 0.1 Hz and phosphate and silicate concentrations at a rate half that. Several minor improvements, including reduced sample-loop size, high sample flushing rate, modified carrier chemistry, and use of peak height rather than peak area as a proxy for nutrient concentration aided in the increase in sampling rate. The most significant improvement, however, was the construction of a copperized cadmium NO₃⁻ reduction column that had a high surface area to volume ratio and a stable packing geometry. Preliminary results from a cruise in the Ross Sea in austral spring of 1997 are shown. Precision of all three analyses is better than 1%. Comparison of the nutrient concentrations determined by the rapid analysis method described here with traditional discrete analyses shows that nitrate and silicate determined by the two approaches are within a few percent of each other, but that the phosphate concentrations determined by the rapid analysis are as much as 10% lower than those determined by the discrete analyses.
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  • Hales, B., van Geen, A., & Takahashi, T. (2004). High-frequency measurement of seawater chemistry: Flow-injection analysis of macronutrients [Electronic version]. Limnology and Oceanography: Methods, 2, 91-101.
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  • description.provenance : Made available in DSpace on 2010-07-10T00:06:44Z (GMT). No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004_Flow-Injection.pdf: 1198407 bytes, checksum: 605d95836ce8fc49f6a840c910f783bd (MD5) Previous issue date: 2004-03
  • Vol. 2 (2004)
  • description.provenance : Submitted by David Moynihan (dmscanner@gmail.com) on 2010-07-08T19:52:46Z No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004_Flow-Injection.pdf: 1198407 bytes, checksum: 605d95836ce8fc49f6a840c910f783bd (MD5)
  • Limnology and Oceanography: Methods
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2010-07-10T00:06:44Z (GMT) No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004_Flow-Injection.pdf: 1198407 bytes, checksum: 605d95836ce8fc49f6a840c910f783bd (MD5)

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