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(Seal Analytical)

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Flash EA1112 CHN analyzer

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» Seal Analytical

The Woods Hole Oceanographic Institution Nutrient Analytical Facility utilizes several state of the art methods and instruments for quantifying bio-element concentrations in environmental samples. The facility operates a SEAL AA3  four-channel segmented flow analyzer to determine dissolved nutrient concentrations in aquatic ecosystems ranging from groundwater to the open ocean. It offers a high sample throughput coupled with simple and rapid method changeover to maximize productivity in determining nutrients including: ammonium, nitrate, nitrite, orthophosphate, silicate, and total dissolved nitrogen. The methods used for analysis are USEPA approved. For solid phase carbon and nitrogen determination, the facility houses a Flash EA1112 Carbon/Nitrogen Analyzer using a Dynamic Flash Combustion technique. The instrument is very dependable and has been proven to have a high degree of reproducibility. 

This current nutrient analyzer has Ultra Low Detection Limits listed below. 

Analyte Detection Limit Method Determined
Ammonium 0.034 μMol/L G-171-96 EPA pt.136, app B
Nitrate+Nitrite 0.010  μMol/L G-172-96 EPA pt.136, app B
Silicate 0.016 μMol/L G-177-96 EPA pt. 136, app B
Phosphate 0.025 μMol/L G-297-03 EPA pt. 136, app B


Armstrong, F.A.J., Sterns, C.R. and Strickland, J.D.H, 1967 Deep Sea Res. 14, pp. 381-389.  "The measurement of upwelling and subsequent biological processes by means of Technicon AutoAnalyzer and associated equipment."

Grasshoff, K., Technicon International Congress, June 1969

Federal Water Pollution Control Administration Methods for Chemical Analysis of Water and Wastes, November 1969.

Methods of Seawater Analysis, K. Grasshoff et. al., Verlag Chemie, 2nd Edition, 1983.


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Last updated December 30, 2013
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