Total Uranium Analyzer Company

Product NameTrace uranium analyzer

Product model: WGJ-III

Product exhibitor: Hangzhou Daji Optoelectronic Instrument Co., Ltd

Trace uranium analyzerdetailed introduction

WGJ-III uses the operating system and integrated circuits manufactured by the company, and generally has few malfunctions. In order to make it convenient for customers to use the instrument, our company adopts the supply method of home delivery, installation and acceptance, and provides a two-year warranty period. The instrument is equipped with a LCD touch screen, printer, RS232 serial interface, and can directly input test data into the computer. It is a good replacement product for similar instruments

Trace uranium analyzerWorking Principle:

The instrument is controlled by a microcontroller to coordinate the operation of the whole machine, one of which is to output excitation light triggering pulses. The excitation light power supply component generates appropriate high voltage, causing the pulse light tube to emit ultraviolet pulse light. After being focused and filtered by the optical path, the sample is excited. The trace uranium in the sample is excited, and the uranium fluorescence signal produced is filtered by a fluorescence filter and then received by a photomultiplier tube for photoelectric conversion.

The high voltage required for PMT tube is generated by the high voltage module and controlled by the microcontroller. The output uranium fluorescence signal is pre amplified and sent to the fluorescence sampling circuit. The operating system controls signal delay, fluorescence sampling, A/T conversion, LCD touch screen display, printer printing of each test value and final test result. The low-voltage switch power supply outputs ± VCC and VDD for use in the corresponding circuit

Trace uranium analyzerTechnical parameters of the instrument
1. Incentive source: imported ultraviolet light source
2. Test results: Linux system automatically calculates, touch LCD screen (not keyboard controlled LCD screen) and printer display and print test results on the same panel in front of each other
3. Result saving: The test results can be printed using the embedded built-in thermal printer in front of the instrument (for easy observation). The instrument comes with data storage and management functions, and can set a time for data query and deletion. The data can be saved to the cloud platform or USB drive
4. Measurement object: Direct measurement of liquid samples (solid samples converted into aqueous solutions do not require separation or enrichment, and can be quickly measured by appropriate dilution)
5. Detection limit: ≤ 0.01ng/ml (defined as three times the standard deviation)
6. Uranium measurement range: 0-100ng/ml. For high concentration samples, appropriate dilution is required
7. Measurement accuracy: ≤ 1%
8. Linear correlation coefficient: r ≥ 0.9998 (proof can be provided)
9. Accuracy: ≤ 8%
10. Linear storage: can store standard curves, measurement parameters, and measurement result data when turned off
11. Data management: Supports storage of ≥ 500000 measurement result data, which can be queried and exported;
12. Operability: The software automatically adjusts the frequency and provides user-friendly step-by-step prompts to guide the operation process
14. Stability: Measurement after preheating for 1 hour, relative standard deviation of 2ng/ml standard uranium measured for 8 hours is ≤± 7%
14. Working environment: Temperature between 10 ℃ and 40 ℃, humidity less than 85% (30 ℃)
15. Volume: 491 × 364 × 208 mm
16. Net weight: 10Kg
17. Power supply: AC220V ± 10%, 50HZ

Trace uranium analyzermeet the standards

1. GB 14883.7-2016 Food Anjia Standard Determination of Natural Thorium and Uranium Radioactive Substances in Food

2. HJ 840-2017 Analytical Methods for Trace Uranium in Environmental Samples (Draft)

3. EJ/T 823-2016 FluorescenceTrace uranium analyzer

4. EJ/T 550-2000 Determination of Uranium in Soil, Rock and Other Samples by Laser Fluorescence Method

5. GB 5749-2022 "Sanitary Standards for Drinking Water"

6. GB 23727-2020 Regulations on Radiation Protection and Radiation Environment Protection in Uranium Mining and Metallurgy

7. HJ 61-2021 Technical Specification for Radiation Environment Monitoring

8. HJ 1009-2019 Technical Specification for Operation of Radiation Environment Air Automatic Monitoring Station

Drawing of work curve

Prepare a series of standard solutions containing different amounts of uranium and thorium based on the uranium and thorium content of the test sample using blank reagent samples. Follow the sample operation steps to determine the absorbance values of uranium and thorium. Draw working curves for uranium and thorium, with absorption value A as the vertical axis and uranium and thorium content as the horizontal axis, respectively.

4.7 Result Calculation

4.7.1 Water and air samples

Calculate the uranium and thorium concentrations in water or air samples according to equation (6):

……………………（6）

In the formula: C - the concentration of uranium and thorium in water or air samples, in μ g/L or μ g/m3;

M - the amount of uranium or thorium in the measured sample obtained from the working curve, μg;

V - volume of water sample for analysis (L) or volume of air sample under standard conditions, m3

4.7.2 Biological and Soil Samples

Calculate the uranium and thorium content in biological or soil samples according to equation (7):

……………………（7）

In the formula: A - the uranium and thorium content in biological or soil samples, μg/kg；

M - the amount of uranium or thorium in the measured sample obtained from the working curve, μg;

W - Weight of sample ash for analysis, g；

M - Conversion factor, for biological samples, M is the gray to fresh ratio, g/kg； For soil samples, M＝1000g/kg；

4.8 Determination of Recovery Rate

The water sample is blank with reagents, and standard solutions of uranium and thorium are added. Follow the sample processing and determination steps, and calculate the overall chemical recovery rate Y according to equation (5). The same applies to air, biological, and soil samples in 3.5.4.

4.9 Method Validation

4.9.1 Blank test

Whenever changing reagents, bi must conduct a blank test; At least 2-3 blank samples should be taken for blank experiments when analyzing each batch of samples; Regularly conduct blank experiments, with a minimum sample size of 4.

4.9.2 Precision

Excluding sampling and preprocessing errors, the relative standard deviation of repeatability is less than 10%, and the relative standard deviation of reproducibility is less than 15%.

analysis steps

3.5.1 Determination of Linear Range

Using blank samples, follow the sample analysis steps, adjust the sensitivity of the instrument to the appropriate range according to the instrument usage requirements before measurement, add uranium standard solution in batches, and measure and record the fluorescence intensity separately. Draw a standard curve of fluorescence intensity uranium concentration with fluorescence intensity as the vertical axis and uranium concentration as the horizontal axis, determine the linear range of fluorescence intensity uranium concentration, and require it to be within the linear range, r >0.999。 Calculate the ratio of fluorescence intensity to uranium concentration standard B.

The actual sample should be measured using the standard addition method within a linear range. This standard does not require a re determination of the linear range for each measurement, but if there are changes in indicators such as instrument sensitivity adjustment or fluorescence enhancer replacement, or if the fluorescence intensity measurement value is within the originally determined linear range boundary, the linear range should be re determined.

3.5.2 Sample determination

3.5.2.1 Turn on the instrument according to the operating procedures and wait until the instrument is stable. Check and verify the sensitivity and other indicators of the instrument to determine the linear range.

3.5.2.2 Transfer 5.00mL of the sample solution to be tested into a quartz colorimetric dish, place it in the measurement chamber, measure and record the reading N0.

3.5.2.3 Add 0.5mL of fluorescence enhancer (anti-interference fluorescence enhancer solution for soil sample determination) to the sample, mix thoroughly, and observe if precipitation occurs in the sample. The sample should be scrapped (note: the tested sample must be diluted or treated by other methods until no precipitation occurs before entering the measurement step).

3.5.2.4 Measure and record the fluorescence intensity N1.

3.5.2.5 Add 50 μ L of 0.100 μ g/mL uranium standard solution to the sample (when the uranium content is high, add 50 μ L of 0.500 μ g/mL uranium standard solution) and mix thoroughly. Measure and record the fluorescence intensity N2.

3.5.2.6 Check that N2 should be within the linear range of the standard curve. If it exceeds the linear range, the sample should be diluted and retested.

3.5.2.7 Check the ratio of N2-N1 to the standard amount of uranium added, which should match the B value of the standard curve.

3.5.3 Result Calculation

3.5.3.1 Calculate the uranium content of the water sample according to equation (1):

C water=× 1000 (1)

In the formula: C water - the concentration of uranium in the water sample, μg/L；

N0- Fluorescence intensity of the sample before the addition of fluorescence enhancer;

N1- Fluorescence intensity of the sample after adding fluorescence enhancer;

N2- Fluorescence intensity of the sample after adding standard uranium;

C1- Concentration of uranium standard solution added when measuring fluorescence intensity N2, μg/mL；

V1- the volume of uranium standard solution added when measuring the fluorescence intensity N2, mL；

V0- volume of water sample for analysis, mL；

K - dilution factor of water sample.