The application of ceramic heating board in many industries
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Ceramic electric heating plate in the laboratory can be widely used for the determination of molybdenum and titanium in water quality and the determination of 12 metal elements in soil and sediment.
1. Application of laboratory ceramic electrothermal plate in determination of molybdenum and titanium in water quality (digestion by heating plate) :
Total molybdenum sample preparation: ceramic electric hot plate digestion lab move samples from 50.0 ml after shake in the middle of 100 ml beaker, add 5 ml of nitric acid, cover the watch glass, ceramics, heat plate on 95 ℃ + 5 ℃ heating evaporation to the solution of the remaining 2 ml ~ 3 ml, cooling, according to the condition of digestion may continue to join the nitric acid, every time 3 ml, repeat the digestion process, until no more brown smog, cooling. Slowly add 3ml of hydrogen peroxide, cover the surface dish, and heat the hot ceramic plate at 95±5℃ for reflux. Continue to add hydrogen peroxide, 1ml at a time, as the case may be, until only subtle bubbles or appearance no longer change, remove the surface dish, evaporate the solution until it is nearly dry, and cool down. Add 1ml nitric acid solution, rinse the inner wall of the beaker and the surface dish with experimental water for at least 3 times, transfer the whole amount into a 50ml volumetric flask, use the experimental water to the standard line, and shake well. If there are insoluble particles in the sample, it can be placed or filtered by water system microporous filter membrane, and the clarified liquid can be stored in polyethylene bottle.
2. Application of ceramic heating plate in the determination of 12 metal elements in soil and sediment (ceramic heating plate digestion) :
Sample preparation: ceramic electric hot plate digestion lab move take 15 ml aqua regia in 100 ml conical flask, add 3 or 4 small glass beads, put the glass on the funnel, on the ceramic heating plate heated to boiling, make the aqua regia vapor infiltrating the conical flask wall, about 30 min, abandon to after cooling, washed with water experiment conical flask wall, dry. According to take samples to test 0.1 g (0.0001 g), under the above has been prepared in a 100 ml conical flask, add 6 ml aqua regia solution, put the glass on the funnel, heating on the ceramic heating plate, keep aqua regia in micro boiling condition 2 h (keep aqua regia steam backflow on bottle and glass funnel, but response not too severe and lead to overflow) sample. After digestion, it was allowed to cool down to room temperature, and the extract was filtered and collected in 50 ml volumetric flask with slow quantitative filter paper. After the extraction is exhausted, clean the glass funnel, conical flask and filter residue with a small amount of nitric acid solution for at least 3 times, and then filter and collect the washing liquid in the volumetric flask, and use the experimental water to settle the volume to the scale.
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