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Study on the Method of In-Situ Quick Detection of Soluble Silicates in Seawater
Author(s): 
Pages: 76-80
Year: Issue:  2
Journal: Ocean Technology

Keyword:  soluble silicatesincomplete chemical color reactionquick detection;
Abstract: An in-situ instrument for rapidly detecting soluble silicates in seawater is developed and presented based on the sequential injection analysis(SIA) and spectrophotometer. Through the improvement of the silicomolybdenum blue spectrophotometry method in the Specification for Marine Monitoring, the sample injection method and color reaction time have been optimized. The injection interval between samples and reagents has been cancelled, and the time of color reaction has been shorten to 50 s and the single sample measurement takes only 2 minutes under the prerequisite of retaining the accuracy and reliability of silicate measurement. For in-situ applications, research has been conducted on the effects of environmental factors on measurements. The results indicate that a signal reduction of 20% in absorbance occurs when the sample salinity varies from 0 to 35,whereas no obvious changes in absorbance are observed when the salinity is between 28 and 35. Based on the10 cm liquid core waveguide colorimetric tube, the limit of detection of the instrument is 5.8 nmol/L.
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