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Process and device for jointly digesting total phosphorus and total nitrogen

A process and digestion cell technology, applied in the preparation of test samples, etc., can solve the problems of loose pipeline layout and mechanical parts layout, easy occurrence of dead ends, and large power consumption, so as to reduce the amount of test reagents and liquid discharge. , the effect of prolonging the maintenance cycle and reducing the operating power consumption

Pending Publication Date: 2019-01-04
XIAMEN STANDARDS SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In addition, the bulky design of split or integrated total phosphorus and total nitrogen equipment on the market is due to the fact that part of the circuit design uses PLC, and the entire circuit board is bulky. The layout is loose; in addition, the digestion device is large in size, resulting in a large final volume of the whole machine
[0008] There are many types of digestion technologies on the market. Some digestion technologies are more complicated and are mostly used for laboratory digestion. The application of laboratory digestion devices does not need to consider air tightness, power consumption, volume, and easy-to-clean flow. Road and other problems, in which the temperature measurement method measures the steam temperature, which consumes a lot of power, and is not suitable for high-integration on-line monitoring instruments; The way of exporting and unattended monitoring is inconvenient. The conventional digestion tank adopts the form of only one interface, but this method is prone to dead ends during the cleaning process, cross-contamination of test water samples is easy to occur, and there is interference in continuous testing; Condensation reflux technology is too complicated to apply to online monitoring instruments, and requires a lot of power consumption; the UV digestion device at a certain temperature on the market is to avoid airtightness problems under long-term unattended high-temperature and high-pressure conditions, and the UV Digestion has the advantage of lower power consumption, but the digestion efficiency of this digestion method is low, especially for specific substances, the digestion effect is not obvious, and it cannot meet the digestion requirements of some specific substances; The high-pressure valve integrated design device has poor flexibility and high customization cost. Due to the basic design of the mechanism, there are few optional types of components such as high-temperature and high-pressure valves, and the quality is not easy to control

Method used

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  • Process and device for jointly digesting total phosphorus and total nitrogen
  • Process and device for jointly digesting total phosphorus and total nitrogen
  • Process and device for jointly digesting total phosphorus and total nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take multiple organic standard samples, specifically sample 1 (total phosphorus concentration 0.050 mg / L, total nitrogen concentration 1.00 mg / L), sample 2 (total phosphorus concentration 0.200 mg / L, total nitrogen concentration 2.00 mg / L), sample Three (total phosphorus concentration 0.600 mg / L, total nitrogen concentration 4.00 mg / L);

[0039] Take 25mL of sample 1, add 5mL of K with a concentration of 0.15 mol / L to it 2 S 2 o 4 Solution and 1mL NaOH solution with a concentration of 0.75 mol / L, and sealed and digested at 120°C to 124°C for 25 minutes, after digestion, the liquid was discharged into spectral analysis for colorimetry, and the total nitrogen was measured as: 0.93mg / L; Add the total phosphorus color reagent, and perform colorimetry in the colorimetric analysis, and the measured total phosphorus is 0.049 mg / L;

[0040] Take 50mL of sample two, add 10mL of K with a concentration of 0.25 mol / L 2 S 2 o 4 Solution and 2mL NaOH solution with a concentrati...

Embodiment 2

[0046] Take multiple unknown samples, specifically sample four, sample five, and sample six.

[0047] Get 60mL sample 4, add 10mL concentration wherein to be the K of 0.2 mol / L 2 S 2 o 4 solution and 2mL NaOH solution with a concentration of 1.0mol / L and sealed and digested at 120°C to 124°C for 30 minutes. After digestion, the liquid was discharged into spectroscopic analysis for colorimetry. The total phosphorus color reagent was used for colorimetric analysis, and the measured total phosphorus was 0.049 mg / L.

[0048] Take 80mL sample five, add 10mL concentration to it and be the K of 0.15mol / L 2 S 2 o 4 solution and 2mL NaOH solution with a concentration of 0.75mol / L and sealed and digested at 120°C to 124°C for 40 minutes. The total phosphorus color reagent was used for colorimetric analysis, and the measured total phosphorus was 0.209mg / L.

[0049] Get 90mL sample 6, add 20mL concentration wherein is the K of 0.25mol / L 2 S 2 o 4 Solution and 5mL NaOH solution w...

Embodiment 3

[0056] like figure 1 , figure 2 As shown, a device for combined digestion of total phosphorus and total nitrogen includes a digestion tank housing 1, a digestion tank 2, an upper sealing assembly 3, a lower sealing assembly 4, a water outlet 5 and a water inlet 6, wherein the digestion tank housing 1 is set There are a front cover 11 and a back plate 12, the front cover 11 and the back plate 12 are installed on the digestion tank shell 1 through bolts 111, and the back plate 12 is provided with perforations 121; the upper and lower sides of the digestion tank shell 1 are also provided with The connecting hole 13 and the lower connecting hole 14 are used to set the upper sealing assembly 3 and the lower sealing assembly 4 respectively. The upper sealing assembly 3 includes an upper metal briquetting block 31 and an upper sealing briquetting block 32. The upper metal briquetting block 31 is provided with a built-in step Surface 311 and the periphery are provided with external ...

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Abstract

The invention discloses a process and a device for jointly digesting total phosphorus and total nitrogen. The process includes adding K2S2O4 and NaOH used as oxidizing agents into to-be-tested samples; hermetically digesting the total phosphorus and the total nitrogen under the condition of the temperatures of 120-124 DEG C for 25-40 minutes. A substance quantity ratio of the K2S2O4 to the NaOH is1:1. The process and the device have the advantages that digestion principles are deeply comprehended by means of joint digestion, device properties and flow path designs are combined with one another, methods are optimized and improved, substantive tests are carried out, and the digestion efficiency can reach 90% at least as proved by total phosphorus and total nitrogen detection on the digestedwater samples after the water samples are jointly digested at one step; the integral deice is safe and reliable and is long in use cycle, and workload on maintenance workers can be relieved.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a process and a device for combined digestion of total phosphorus and total nitrogen. Background technique [0002] Total phosphorus is the result of converting various forms of phosphorus into orthophosphate after the water sample is digested, and it is measured in milligrams of phosphorus per liter of water sample. Total nitrogen is one of the important indicators to measure water quality. It is the sum of inorganic nitrogen and organic nitrogen. When the ammonia nitrogen content is higher, the digestion process is more prone to loss, so a special sealed digestion device is required. [0003] In the existing process, if both total phosphorus and total nitrogen need to be digested and detected, two independent processes and two independent equipment are required to digest total phosphorus and total nitrogen respectively. Most of the total phosphorus and total nitrogen on-lin...

Claims

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Application Information

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IPC IPC(8): G01N1/44
CPCG01N1/44
Inventor 柯慧贤李群李少阳卓静高春芳
Owner XIAMEN STANDARDS SCI INSTR
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