Detection of low detection limit particles in water

Absorption spectroscopy can provide a new perspective for examining samples in various industries, such as in the water supply industry, where it can verify the quality and purity of water and determine which pollutants and particles may not be visible to the naked eye.

It is crucial to be able to detect particles with low detection limits in water, such as one in a million(ppm)The scale requires a highly sensitive spectrometer. In this experiment, we will demonstrate to youAvantesThe ultimate detection capability of the spectrometer.

Experimental system and process

Experimental system:

This experiment uses a high-sensitivity scientific grade spectrometerAvaSpec-HEROCombined with a long path colorimetric dish holder and balanced deuterium-halogen light sourceAvaLight-DH-S-BALTo measure the absorbance of the sample.

AvaSpec-HERO

AvaSpec-HEROIt is a research grade spectrometer based on a high-sensitivity compact optical platform (focal length)=100mm, numerical aperture=0.13）And1024x58Pixel backlit designCCDThe detector has both high sensitivity and high resolution.AvaSepc-HEROEquipped with thermoelectric refrigeration device to adapt to applications that require longer integration time under low light conditions. the adoptedAS7010Circuit board, withADConverter can control noise signals at a very low level to achieve better signal-to-noise ratio and dynamic range. The optional combination of multiple models of gratings and slits allows you to configure the spectrometer more flexibly, making it suitable for200-1160nmVarious applications within the scope, such as fluorescence measurement of weak signals to demanding Raman measurements,AvaSepc-HEROAll are measurement tools that you can choose from. The spectrometer'sUSB3.0High speed communication interface and gigabit Ethernet communication interface enable it to communicate with computers simply and quickly. Meanwhile, its numbersIOThe interface can be used for external triggering, controlling the shutter, pulse light source, and other functionsAvantesInstruments.

AvaLight-DH-S is a high-power deuterium halogen combination light source, but like any non-equilibrium deuterium halogen light source, it also exhibits a very strong alpha peak at 656nm. Therefore, Avantes has developed the AvaLight-DH-S-BAL balanced deuterium halogen light source, which greatly reduces the intensity at 656nm using a dichroic filter. Although the total power of the light source has been reduced, its dynamic range has increased by 20 times. AvaLight DH-S-BAL can efficiently output continuous spectrastableThe output range is from 200nm to 2500nm. It also includes a built-in TTL shutter and a bracket that can accommodate 50x50x5mm filters. TTL fastThe door can be controlled through the AvaSpec spectrometer, which allows for the automatic storage of dark backgrounds in the AvaSoft FULL software.

AvaLight DH-S-BAL Balanced Deuterium Halogen Light Source

Experimental Procedure

In this experiment, we usedAvaSpec-HEROandAvaLight-DH-S-BALTo measure 10 The sample in the millimeter path colorimetric dish. We tested three different concentrations of butyl paraben solutions in distilled water. The concentrations of the solutions are:100ppmThe10ppmand1ppmWe used itAvaSoftThe absorbance measurement module in the software is used to collect data.

Experimental results and analysis

We used a long path colorimetric dish(10mm)To ensure that particles in the water can be measured. Cross compare the measured spectral data with the known absorption spectrum of butyl paraben, and display214 nmand256 nmThe absorption peak at this location is very accurate.

Conclusion

AvaSpec-HEROVery suitable for applications that require both high sensitivity and high resolution.