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Total alkalinity measurer

A measuring instrument, the technology of total alkalinity, which is applied in the direction of analyzing the material through chemical reaction and analyzing the material through observing the influence of the chemical indicator, can solve the problems of in-situ measurement and complex structure of the instrument, etc. Achieve the effects of fast determination speed, simplified structure and operation steps, and small measurement error

Active Publication Date: 2008-07-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of gas in the stripping process, the existing method and device for measuring total alkalinity based on the pH value method can realize online continuous measurement, but the instrument structure is complex and cannot be measured in situ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] See Figures 1 and 2. The invention is provided with water sample inlet 1, reagent pumps 21 and 22, temperature sensor 3, mixer 4, spectroscopic system 5, carbon dioxide removal device 6, eight-way valve 7, quantitative loop 8, reagent bag 9, waste liquid outlet 10, A control circuit 11, and a sealed casing 12.

[0030]The airtight casing 12 seals various parts of the instrument inside, and the water sample inlet 1 and the waste liquid outlet 10 are arranged on the wall of the airtight casing 12 . Reagent pump 21 is used for transporting water samples, and its inlet is connected with eight-way valve 7 . The mixer 4 is used to promote uniform mixing of the water sample and the acid, and its inlet is connected to the outlet of the reagent pump 21 . A temperature sensor 3 is housed in the mixer 4 for accurately measuring the temperature of the internal mixed solution. The spectroscopic system 5 is composed of a tungsten lamp 51 (light source), a flow cell 52, a grating 5...

Embodiment 2

[0035] Referring to Fig. 5 and 6, similar to Embodiment 1, the difference is that the carbon dioxide removal device 6 is made up of a vent tube 61 and a miniature vacuum pump 62 placed in a sealed container, and the carbon dioxide in the liquid in the vent tube 61 is rapidly permeated through the vent tube wall The micro vacuum pump 62 is pumped out. Other symbols are exactly the same as those in Figs. 1 and 2 .

[0036] Reagent pumps 21 and 22 can adopt pulse pumps with low precision. Vent pipe 61 adopts Teflon produced by DuPont Company of the United States  Made of AF1600 material. The acid-base indicator in acid is bromocresol purple.

[0037] Referring to Figures 7 and 8, similar to Embodiment 1, the difference is that a miniature vacuum pump control module 8 is added, which is composed of a power module Q25, and a signal is sent from the microprocessor U1 to control the start and stop of the miniature vacuum pump P5 through Q25. Q25-power module IRF630, P5-miniature...

Embodiment 3

[0040] Similar to embodiment 2, its difference is that lye adopts potassium hydroxide. Place the instrument directly in the river, measure the total alkalinity of the river water, and get a detection data every 5 minutes.

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Abstract

A total alkalinity measuring apparatus relates to a water body total alkalinity determining device which provides a water body total alkalinity measuring apparatus suitable for environment monitoring and industrial water treatment. The invention is provided with a water sample inlet, two reagent pumps, a mixer, a temperature sensor, an optical splitting system, a CO2 removing device, an eight-channel valve, a reagent bag, an amount fixing ring, a waste liquid outlet, a liquid circulating pipeline, a control circuit and a sealing shell. The water sample inlet and the waste liquid outlet are arranged on the shell; two reagent pumps are respectively connected with the eight-channel valve and the reagent bag; an inlet of the mixer is connected with an outlet of the reagent pum; the temperature sensor is arranged in the mixer and the optical splitting system consists of an optical source, a circulating pool, an optical splitting element and an optoelectronic detector; an inlet of the circulating pool is connected with an outlet of the mixer; an inlet of the CO2 removing device is connected with an outlet of the circulating pool; the reagent bag is connected with the inlet of the reagent pump; the amount fixing ring a section of annular tube used for storing acid; the control circuit is connected with the reagent pumps, the eight-channel valve, the temperature senor and the optical splitting system.

Description

technical field [0001] The invention relates to a water body total alkalinity measuring device, in particular to a device suitable for the field of environmental monitoring and industrial water treatment, which can measure the water body total alkalinity with high accuracy, fast, in situ or on-line. Background technique [0002] Total alkalinity refers to the total amount of substances contained in water that can act quantitatively with strong acids. It is often used to evaluate the buffer capacity of water bodies and the solubility and toxicity of metals in it. It is one of the important detection indicators in environmental monitoring (National Environmental Protection Editorial Committee of "Water and Wastewater Monitoring and Analysis Methods" of General Administration. Water and Wastewater Monitoring and Analysis Methods (Fourth Edition), Beijing: China Environmental Science Press, 2002.120-126); In the field of industrial water treatment, alkalinity is a measure of circ...

Claims

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Application Information

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IPC IPC(8): G01N21/80
Inventor 李权龙袁东星戴民汉杨波陈进顺戴君伟
Owner XIAMEN UNIV
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