How to use water quality analyzer correctly for water quality testing?

1. Preparation

Be familiar with the instrument: Before using the water quality analyzer, carefully read the instrument's instruction manual to understand the instrument's functions, operation methods, measurement range, accuracy and other information. Be familiar with the functions of the various components and buttons of the instrument to ensure that the instrument can be operated correctly.

Check the instrument status: Check whether the appearance of the water quality analyzer is damaged, whether the display screen is displaying normally, whether the battery power is sufficient (if it is battery-powered), and whether the various connections are firm. Ensure that the instrument is in good working condition.

Prepare reagents and standard solutions: Prepare corresponding reagents and standard solutions according to the water quality indicators to be tested. Ensure that the purity and validity period of the reagents meet the requirements and that the concentration of the standard solution is accurate and reliable.

Collect water samples: Collect representative water samples and avoid collecting water samples containing a large amount of impurities, suspended matter or bubbles. Collect water samples in clean containers and test them as soon as possible to prevent changes in the composition of the water samples.

2. Instrument calibration

Calibrate the instrument according to the requirements of the instrument manual. Normally, the instrument needs to be calibrated with a standard solution to ensure the accuracy of the measurement results.

Pour the standard solution into the cuvette or measuring cell and calibrate according to the instrument's operating steps. During the calibration process, pay attention to whether the instrument's display value is consistent with the concentration of the standard solution. If there is a deviation, it needs to be adjusted.

After the calibration is completed, save the calibration parameters for use in subsequent measurements.

Three, sample measurement

Pour the collected water sample into the cuvette or measuring cell, and be careful not to generate bubbles. If the water sample needs to be pre-treated, such as filtering, dilution, etc., it should be treated as required before measurement.

According to the instrument's operating steps, select the water quality index to be measured and start the measurement program. The instrument will automatically analyze the water sample and display the measurement results.

During the measurement process, pay attention to whether the instrument's display value is stable. If the display value fluctuates greatly, it may be that the water sample is uneven or the instrument is faulty, and it is necessary to re-measure or check the instrument.

For some measurement indicators that require chemical reactions, such as COD, ammonia nitrogen, etc., the corresponding reagents should be added as required, and the measurement should be performed within the specified time to ensure the accuracy of the measurement results.

4. Data Recording and Processing

After the measurement is completed, record the measurement results in time. When recording, indicate the time, location, water sample number, measurement index, measurement value and other information for subsequent data analysis and processing.

According to the needs, perform data processing on the measurement results, such as calculating the average value, standard deviation, error, etc. If the measurement result exceeds the specified range, it is necessary to re-measure or check the water sample collection and processing process.

Compare the measurement results with the relevant standards or specifications to determine whether the water quality meets the requirements. If the water quality does not meet the requirements, it is necessary to take appropriate measures to deal with it or further analyze the reasons.

5. Instrument Maintenance and Care

After the measurement is completed, clean the cuvette or measuring cell in time to avoid contamination of the instrument by residual water sample or reagent. Use a clean soft cloth to wipe the outer shell of the instrument to keep the instrument clean.

Perform regular maintenance and care on the instrument, such as replacing reagents, cleaning sensors, calibrating instruments, etc. Perform regular maintenance and care in accordance with the requirements of the instrument manual to ensure the performance and accuracy of the instrument.

If the instrument fails, it should be repaired in time. Do not disassemble the instrument by yourself to avoid causing greater damage. You can contact the instrument manufacturer or professional maintenance personnel for repair.

In short, the correct use of water quality analyzers for water quality testing requires careful preparation, instrument calibration, sample measurement, data recording and processing, and instrument maintenance and care to ensure the accuracy and reliability of the measurement results.