1、 Multi parameter water quality analyzer material:

The materials for test tubes generally include low borosilicate, neutral borosilicate, and high borosilicate, which can be used without color comparison. In cases where water quality digestion and color comparison are required, neutral borosilicate is selected as the material.

There are three types of materials for the lid, white polypropylene is used for one-time use; Transparent polycarbonate is used in situations where it can be reused; Black phenolic resin is used for repeated use of test tubes larger than 110mm.

IIPrecautions for digestion tube of multi parameter water quality analyzer

1. Use a digestion instrument that matches the bottom of the tube, a round bottom digestion instrument with a round bottom, and a flat bottom balanced digestion instrument. Otherwise, uneven heating may cause the tube to rupture. When placing the tube into the test tube, it should be slowly inserted to avoid rupture caused by violent collision of the digestion tube with the digestion hole. Based on past experience, some bursting of digestion tubes are caused by improper operation.

2. Avoid using digestion tubes and lids with mismatched threads. Mismatching will result in unsealing and air leakage. The main consideration is whether the twisting process is smooth and fluid, and if the lid is not too crooked, it meets the requirements.

3. Avoid having too many scratches. Friction between pipes can cause scratches, and cleaning bottles can also easily cause scratches. The scratch is the weak point of the pipe's strength.

4. Avoid using damaged bottles and lids. Due to manual intervention during transportation and production, this type of product is inevitable. Do not use defective bottles and lids.

5. Do not directly digest the water sample, there must be corresponding reagents. The boiling point of water is very low, and the more water there is, the greater the pressure inside the bottle, and the lid will not be able to hold it. If encountering a situation where a large amount of water samples need to be digested, please use a lid with a harder material and higher temperature resistance.

Taking the determination of COD index in water samples as an example, due to the need to add chemical reagents such as concentrated sulfuric acid before digestion, and the large difference in specific heat capacity and density between concentrated sulfuric acid and water, if not mixed evenly during digestion, it may cause the sample to boil and cause the dissolution tube to rupture. Therefore, it is necessary to mix the water sample evenly before digestion to prevent the dissolution tube from bursting.

IIIPrecautions for color comparison of multi parameter water quality analyzer

1. Shake well before color comparison, and wipe the test tube clean with a test tube cloth before placing it in the photometer.

2. Choose calibrated instruments and pipettes with smaller errors to avoid further errors caused by human and equipment factors.

3. If there are scratches, do not align the scratch surface with the colorimetric position.

In the rapid digestion spectrophotometric method, the requirement for the comparison tube is that the absorbance error is within ± 0.005, which is within 10 units. Therefore, the same batch of comparison tubes must be within the error range as much as possible. If 20% of the tubes in a batch exceed the error range by a lot, then the batch of comparison tubes is unqualified.

5. When testing pipe errors, please use pure water for testing.

The following is an introduction to the independent research and development production of Sci Tech StarPortable multi parameter water quality analyzerThe characteristics of the instrument are introduced as follows:

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Keywords of this article:XG300 desktop multi parameter water quality analyzer，XG301 portable multi parameter water quality analyzer