2 general quality test varieties, project miscellaneous, impossible to each measuring a indicator of fixed using a special instrument, are often used interchangeably, but on the use of the instrument and not through strict cleaning or cleanliness inspection. Must cause the alternation between the pollution of reagent. This may affect the accuracy of test results.

3 on the other hand, to measure capacity and non capacity measure of property and washing method together, are the use of decontamination paint wash, this caused a capacity measure of capacity is not accurate, affect the accuracy of measurement result.

Two, glass container heating error

1 step heating process is often some physical and chemical analysis. In actual work, some people tend to ignore or simply do not clear what instruments can heating, and errors. Glass containers are not in fact can direct heating, such as cylinder, measuring cup, volumetric flask, reagent bottle can not direct heating. Should be selected as appropriate, beaker, flask, flask as the reaction vessel. In the actual work of unknown if these basic knowledge, the inevitable errors, and even caused the accident inspection.

The 2 heating glass container, don't put the container in asbestos online, and directly to the container is placed in a furnace, and the container is heated uneven, and even burst.

3 the use of the process, the temperature change is too intense, or high temperature quenching and the burning glass containers placed directly on the table, and not according to the prescribed placed in asbestos online, leading to loss of vessel rupture, reagents, affecting the normal inspection work.

4 in the actual work, some people are afraid of trouble, not used to correctly use the dryer, for heating appliances require accurate weighing should be dried out slightly cold (about 30s), placed in a dryer cooling to room temperature, weigh (30min only). Warm appliances into the drier, should first cover a slot, wait a few minutes and then cover tightly; move the drier, should not only lower, but should hold the lid to prevent the cover slip to move, causing unnecessary losses.