A Brief Discussion on the Operation Precautions of Turbidity Meter
Turbidity is the turbidity of water, which shows the degree of obstruction of suspended matter in water when light passes through. Suspended solids and colloids such as soil, dust, fine organic matter, zooplankton and other microorganisms in the water can cause turbidity in the water. The turbidity meter was born according to this principle to measure the turbidity of water. The turbidity of water is not only related to the content of suspended substances in the water, but also related to their size, shape and refractive index. The turbidity meter is used to measure the scattering degree of light produced by insoluble particulate matter suspended in water or transparent liquid, and can quantitatively characterize the content of these suspended particulate matter. It can be widely used in turbidity measurement in pure water plants, tap water plants, beverage plants, wine making and pharmaceutical industries, epidemic prevention departments, hospitals and other departments. What matters should be paid attention to in the operation of the turbidimeter: 1. Measure in time after sampling to avoid the lack of authenticity of the measurement results due to temperature changes and water sample particle settlement. 2. The sample bottle must be cleaned very clean to avoid scratches and scratches. Clean the inside and outside of the sample bottle with laboratory detergent, rinse repeatedly with distilled water, and dry in a dust-free drying box. If it is used for a long time, soak it in dilute hydrochloric acid for two hours, and finally rinse repeatedly with distilled water. When holding the sampling bottle, only the upper part of the bottle body can be held to avoid fingerprints entering the optical path. 3. It is an important technique for turbidity measurement to prepare the formalazine standard solution of the calibration point very correctly. To ensure the calculation is correct, pay attention to each step of preparing the standard solution, shake the original solution evenly, and accurately pipette the liquid into zero turbidity. Attention should be paid to the scale of the turbidity meter, and the standard solution of the second turbidity should use a large-capacity measuring bottle to reduce the preparation error. 4. Select the standard solution for calibration. The content should be the full-scale value of the measured range. Shake well before calibration and ensure that the calibration value is correct before measurement. For the measurement of low turbidity and higher precision, the measurement difference between bottles should be considered, and the same sample bottle must be used for calibration and detection. Zero turbidity water should be used for zero calibration, and distilled water can be used when the requirements are not high. 5. A representative water sample can accurately reflect the authenticity of the water source. Therefore, the water samples taken from each sampling point must be fully mixed before measurement to avoid the influence of water sample sedimentation and larger particles. Air bubbles in the vials should be removed during preparation. Condensation drips from the vial body when measuring cold water samples. Therefore, it must be left for a period of time before measurement, so that the temperature of the water sample is close to room temperature, and then wipe off the water on the bottle.