Visual colorimetry for determination of phosphates

A visual colorimetric and phosphate technology, applied in the field of visual colorimetric testing of phosphate, can solve the problems of unfavorable on-site measurement, complex instruments, expensive instruments, etc., and achieve the effect of convenient and fast testing, high sensitivity and simple method

Inactive Publication Date: 2013-09-11
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention provides an easy-to-use way for detecting biological substances that can be harmful or dangerous at very low concentrations (<0 nM). It's also has several technical benefits such as being sensitive enough to measure small amounts with ease, allowing it to test quickly without complex machinery.

Problems solved by technology

This patents describes various techniques related to analyzers like liquid phase atomic absorption spectra or mass spectromagnetization. However these existing analytical tools often involve multiple steps and may result in contamination issues due to their complexity and cost. There has been some attempts at developing simpler but less invasive ways to detect phosphorus values without relying upon traditional procedures involving chemical reduction processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: content is 0--60.00 milligram PO 4 3- / L for the preparation of standard color scales

[0021] Prepare deionized water, 5% ammonium molybdate solution, 30% sulfuric acid solution, analytical reagent is ammonium molybdate working solution, analytical pure (A.R) tin rod, 10 mg PO 4 3- / ml phosphate standard solution.

[0022] 10 mg PO 4 3- / ml phosphate standard solution was diluted to obtain PO 4 3- Contents are 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00, 13.00, 14.00, 15.00, 16.00, 17.00, 18.00, 19.00, 20.00 mg PO 4 3- / L sequentially to 60.00 mg PO 4 3- 60 standard solutions per liter.

[0023] Add 2.00 milliliters of standard solutions of known phosphate concentrations to 60 colorimetric tubes with 2.00 milliliters of scale marks and 10.00 milliliters of marks. From 2.00, 3.00, 4.00, 5.00 mg / L to 60.00 mg / L in turn, add 8 ml of analytical reagent (ammonium molybdate working solution), respectively, insert tin r...

Embodiment 2

[0025] Embodiment 2: the mensuration of boiler furnace water phosphate content

[0026] According to the test principle, under the acidity condition of 0.7--1.5N, ammonium molybdate [(NH 4 ) 2 MoO 4 ] and phosphate (PO 4 3- ) ions to generate yellow molybdenum phosphate heteropoly acid, adding metal tin (Sn) as a reducing agent to reduce the molybdenum in the phosphomolybdenum heteropoly acid molecule from hexavalent to pentavalent to form a blue complex. The depth of the color of the compound is related to the phosphate radical (PO 4 3- ) is directly proportional to the concentration of ions. Determine the phosphate content according to the shade of the blue complex. Its main reaction is as follows:

[0027] h 3 PO 4 +12(NH 4 ) 2 MoO 4 +12H 2 SO 4 =H 3 P(Mo 3 o 10 ) 4 (phosphomolybdenum heteropolyacid)+12(NH 4 ) 2 SO 4 +12H 2 o

[0028] h 3 P(Mo 3 o 10 ) 4 +Sn+2H + =H 3 PO 4 10MoO 3 ·Mo 2 o 5 (Blue phosphomolybdenum blue)+H 2 o

[0029] Pre...

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Abstract

The invention relates to a determination method of phosphates, especially relates to a visual colorimetry for determination of phosphates. The visual colorimetry is used to solve problems of the prior art. The visual colorimetry, which is a novel method for determination of phosphates, needs no expensive equipment, is easy to operate, and can be used to measure the content of phosphates in water. The method comprises the following steps: standard colors are prepared, wherein standard solutions with different amounts of phosphates are subjected to chromogenic reaction, blue complex compounds of phosphomolybdenum blue are produced, photos of the complex compounds with different color shades are taken by an OLYMPUS digital camera, the standard colors are produced by printing, and then each standard color is sandwiched by two piece of glasses with a thickness of 1 to 2mm and is sealed by sealant; corresponding relation of the color of the standard colors and the content of phosphates is revised by subjecting a serious of standard solutions with known concentrations of phosphates to chromogenic reaction, so that deviations of the standard colors in the processes of photographing, printing and sealing are eliminated; and then samples are subjected to chromogenic reaction, and are compared with the standard colors to determine the content of the phosphates of the samples to be determined.

Description

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Claims

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Application Information

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Owner NAVAL UNIV OF ENG PLA
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