The online biotoxicity automatic analyzer is an instrument used for real-time monitoring of biotoxicity (i.e. changes in the concentration of substances harmful to living organisms) in water bodies. It detects toxic changes in water samples by interacting with microorganisms or other organisms in the water, thereby assessing the safety of water quality. The detection process usually includes the following main steps:
1. Sampling and preprocessing
Sample collection: Through an online water sample collection system, water samples are automatically collected regularly or as needed. Usually, collection points are selected in areas with stable water flow and strong representativeness.
Water sample pretreatment: Before entering the analyzer, the water sample may undergo pretreatment steps such as filtration, removal of suspended solids, adjustment of temperature, pH value, or other factors that may affect the analysis. The purpose is to ensure the accuracy of the analysis results.
2. Preparation and cultivation of living organisms
Selecting organisms: Online biotoxicity analyzers typically use microorganisms (such as Escherichia coli, yeast) or aquatic organisms (such as zebrafish, water fleas) as monitoring carriers, which are sensitive to changes in toxicity.
Biological cultivation: Set up a biological cultivation system inside the instrument to ensure that the organism grows and reproduces under stable conditions, reaching a state suitable for biological toxicity testing. The cultivation environment requires strict control of parameters such as temperature, light, and dissolved oxygen.
3. Biological reactions
Exposure experiment: The pre treated water sample enters the reaction chamber inside the analyzer and comes into contact with the organisms being cultured. By observing indicators such as the behavior, metabolism, and survival rate of organisms, toxicity in water samples can be determined.
Reaction monitoring: Instruments will monitor the reactions of organisms, such as:
The growth rate of microorganisms
The activity of water fleas or zebrafish
Changes in the growth curve of yeast or cells
Toxicity assessment: If toxic substances are present in the water sample, the normal growth and activity of organisms will be affected, such as slow growth, increased mortality, behavioral changes, etc.
4. Data collection and analysis
Real time monitoring: During the process of biological reactions, the instrument will automatically collect data. Typical parameters include light absorption, fluorescence intensity, cell density, enzyme activity, etc. These data reflect the response of organisms to water samples.
Data analysis: The instrument will compare the collected data with the preset normal growth mode for quantitative analysis. Determine the toxicity intensity in the water sample through toxicity response curves (such as EC50 value, LC50 value, etc.).
Comparison of toxicity threshold and standards: The instrument will compare the toxicity threshold with relevant standards to determine whether it exceeds the water quality safety standards. Exceeding the standard will trigger the alarm system.
5. Automatic calibration and quality control
Automatic calibration: In order to ensure measurement accuracy, the instrument will undergo regular automatic calibration during operation, especially during long-term monitoring. This usually involves using standard solutions or known toxic substances for validation.
Quality control: Verify the accuracy and stability of the instrument by setting up quality control samples (such as blank samples, known toxicity standard samples). This helps ensure the reliability of the data.
6. Alarm and Feedback
Real time alarm: Once the concentration of toxic substances in the water sample exceeds the set threshold, the analyzer will automatically trigger an alarm and notify the staff to take necessary measures (such as activating water treatment equipment or conducting further investigation).
Data storage and reporting: All monitoring data will be automatically recorded and detailed reports can be generated. These reports can include toxicity curves, concentration change trends, alarm records, and other content.
7. Maintenance and upkeep
Regular cleaning and maintenance: To ensure the long-term stable operation of the instrument, components such as the reaction tank, detector, and sampling device are regularly cleaned and systematically inspected to prevent contamination or equipment damage.
Organism maintenance: Organisms in the instrument need to be regularly replaced and cultured to ensure they work in optimal condition. The health status of organisms can also affect measurement results.
8. Data archiving and remote monitoring
Data archiving: All collected data is usually archived and can be queried at any time. Through cloud platforms or local servers, users can access historical data at any time for trend analysis.
Remote monitoring: some systems support the remote monitoring function. Users can view data in real time through the Internet, conduct remote management and adjust monitoring parameters.
Summary:
The online biotoxicity automatic analyzer can quickly and accurately detect toxic substances in water samples through real-time monitoring of reactions with living organisms. This automated system can provide continuous water quality monitoring without the need for manual intervention, and is widely used in fields such as water quality monitoring, environmental protection, and industrial wastewater treatment.