Chapter 454: Test results that scare the police (1/2)

Chapter 454: Test results that scare the police

Zhang Zhitong and the policee students who stepped into the laboratory for the first time to watch the professor do an experiment

Nervously and expectantly, they surrounded this German Goldman atomic absorption spectrometer

The mystery of the concrete wall has been solved, and the re as the puzzle is solved, they canto thethe cri this time

Because the sample preparation of the atomic absorption spectrometer is relatively cumbersome, it is necessary to collect the test sample first, vaporize the saenerated when the sah-tech inspection n h temperatures

Give a si ate the altar chicken in Shanghai, he used the soil method to test that there were heavy metal residues in it

If it is checked by an atomic absorption spectrometer, let alone a serious excess Even if this altar chicken has eaten a harmful heavy metal food in its entire life, the spectrometer can detect it

One hour later, the test result calish and symbols, and the technicians specially translated them into Chinese The police, like treasures, looked at the to the elements inside

Ferrous oxide, ferroferric oxide, alunesium oxide, monocalcium aluminates, silica calcium carbonate

From the test results, almost all the metal coh temperature

The test results also indicate the proportion of these components in the saest, accounting for 55

”Wait, shouldn't the safe be made of metal? Why are there non-metallic substances such as monocalcium aluminates and silicon dioxide in it?”

A sharp-eyed policeman, Columbus was as excited as he discovered the New World and shouted: ”These kinds of non-metallic substances are likely to be cri the safe”

”What kind of cheredients can be used as chemical additives”

Several police officers in the trace evidence exa the uses of these non- couldn't bear interrupting the policeman's ”major discovery” and heated discussions with them

”I think these non-metallic substances are part of the foamed fire barrier material inside the safe”

””

The small circle from the trace evidence examination room suddenly became embarrassed in the heated discussion, and their hearts were cool

”Ye Qing, in this way, isn't there any foreign ele was also confused When metal is heated in the air, an oxidation reaction will occur

Then a lot of the words ”oxidized” on the test report sounded very high, but in fact, they are ordinary iron, alus after burning

Ye Qing did not answer this question but continued to look at the test report

Zhang Zhitong was right The metal content in the report was one of the n s seem to become unscientific

There nited with a match, and residual elements such as phosphorus and sulfur will inevitably be detected in it Ignite with as, and it will inevitably leave the residual eleas, etc