Molybdenum blue assay for measurement of chemical species

A technology of chemical species and quality, applied in the direction of using chemical indicators for analysis, measuring devices, laboratory containers, etc., can solve the problems of complex instruments, bulky and other problems, and achieve the effect of improving precision and accuracy

Inactive Publication Date: 2019-08-23
国家海洋学中心
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

although more sensitive nutrient analyzers exist, they are large and complex instruments suitable only for shipboard expeditions
Therefore, high-resolution low-concentration measurements over extended periods of time at moderate cost are currently not possible

Method used

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  • Molybdenum blue assay for measurement of chemical species
  • Molybdenum blue assay for measurement of chemical species
  • Molybdenum blue assay for measurement of chemical species

Examples

Experimental program
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Embodiment Construction

[0086] Material

[0087] All chemicals were analytical reagent grade or higher and all solutions were prepared using milli-q (MQ) water (Merck Millipore). The final ratio after mixing with the sample is as described by Patey et al [Patey, M.D., et al., Interferences in the analysis of nanomolar concentrations of nitrate and phosphate in oceanic waters. Analytica Chimica Acta, 2010.673(2):p.109-116. ].

[0088] By mixing 3 g of antimony potassium tartrate trihydrate (C 4 H 2 KO 6 Sb 1.5H 2 O) to prepare a stock solution of potassium antimony tartrate (PAT). By adding 0.575 g of ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 .4H 2 O, 1235.86 g / mol, Sigma Aldrich) was mixed with 24 mL of 5M sulfuric acid (Sigma) and 12.5 mL of stock PAT solution, diluted in 1 L with MQ water, to prepare a molybdic acid solution (Reagent 1). The reducing agent (Reagent 2) was prepared as described in Table 1 by adding 10 g of L-ascorbic acid and surfactant to 1 L of MQ water. f...

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Abstract

A process for measuring a concentration of a chemical species in an aqueous sample employing polyvinylpyrrolidone. The process comprises : providing an aqueous sample containing the chemical species;mixing the aqueous sample with a first reagent that comprises a solution of a molybdenum VI salt to provide a first solution; mixing the first solution with a second reagent that comprises a reducingagent to form a second solution; and measuring a property of the second solution to determine the concentration of the chemical species. Polyvinylpyrrolidone is added to the aqueous sample, the firstreagent, the first solution or the second solution. The intensity of light absorbed or transmitted by the second solution may be used to determine the concentration of the chemical species.

Description

technical field [0001] The present invention relates to the sensing and measurement, ie assay, of chemical species (chemicals) in water. More specifically, it relates to a method of measuring, including continuous monitoring or periodic measurement, of chemical species in water, such as phosphate, arsenate and germanate, over a period of time. The invention also relates to a device for carrying out the method. Background technique [0002] Water is a precious natural resource. In order to effectively maintain, protect and / or manage this resource, it is important to be able to understand and monitor it, for example by obtaining reliable information on water quality and content. For example, there may be a need to sense and measure chemical species in water bodies such as oceans, seas, estuaries, rivers, reservoirs, lakes or ponds or agricultural water, wastewater, drinking water, aquaculture and industrial water, as changes in concentrations can be indicative of water quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/84G01N31/22G01N33/18G01N21/3577G01N21/78
CPCG01N31/22G01N21/78G01N33/84G01N33/182B01L3/502715
Inventor 索克拉蒂斯·卢凯德斯杰拉尔丁·克林顿-贝利马修·莫勒姆
Owner 国家海洋学中心
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