Qualitative analysis and on-site testing of volatile poisons for printing ink adhesives (II)

2.3 The qualitative results of volatile toxic substances in inks and adhesives are compared with those of toxic substances detected in the air in the workplace. According to the table, 2-butanone, isopropanol, xylene, and 2-butanone oxime were detected qualitatively in Jingying brand printing inks produced in Tianjin. Only isopropanol was detected in the workplace, but butanone was not detected. Toluene; 7013 qualitative vinyl acetate detection, vinyl acetate found in the workplace; Taiyuan offset printing ink qualitative analysis did not detect volatile toxic substances, workplace detection of benzene, toluene, xylene, acetate B Ester and solvent gasoline.

2.4 The test results of toxic substances in the air of workplaces of culture, education, printing and youth printing plants are shown in Table 2, Figure 4 and Figure 5. It can be seen from the chart that in addition to the concentration of vinyl acetate in the laminating machine operation exceeding the national hygienic standard, the concentration of other toxic substances detected in the operation position of the ad printing press and the upper operation tower of the newspaper printing press is lower than the hygienic standard. TWA values ​​are all less than 4% of the sanitary standard value, and STEL values ​​are all less than 6% of the hygienic standard value.

3 Discussion <br><br><br><br> Ink, Adhesive Volatile Toxins Qualitative analysis results are not consistent with the results of workplace testing. Qualitative analysis of toxic substances detected in the workplace may not be detected; qualitative analysis of undetected toxic substances may be detected in the workplace. On the one hand, it may be the workplace environment is complex and there are many influencing factors. On the other hand, it can not fully guide the detection of toxic substances in the air of the workplace with the qualitative analysis results of mass spectrometry. Therefore, the mass spectrometry of the ink and adhesive in the actual work and workplace air Toxic substances in the gas chromatographic examination should cooperate with each other. Qualitative analysis did not detect toxic substances in Taiyuan Offset rotary printing ink, the use of toxic substances in the workplace detected benzene, toluene, xylene, ethyl acetate and solvent gasoline concentrations are lower, and their TWA values ​​are in the standard value of hygiene Below 4%, STEL values ​​are below 6% of the sanitary standard value. In combination with occupational hygiene surveys, excluding the effects of changes in production processes and other toxic substances contamination, the qualitative results of mass spectrometry have certain guiding significance for health supervision and hygiene evaluation work. When qualitative analysis of mass spectrometry is not detected, even if toxic substances are detected in the air of the workplace, its concentration will not exceed the standard.

The qualitative analysis of Tianjin Jingying brand printing inks detected the toxic substances 2-butanone, isopropanol, xylene and 2-butanone oxime, while the use of butanone and xylene in the workplace air was not detected. The concentration of propanol is lower than the minimum detection concentration; the qualitative analysis of 7013 rubber detects vinyl acetate, a toxic substance, and it is higher than the hygienic standard for vinyl acetate in the air of the place, which may be a high temperature for the film production process (about 60-70°C). , The result of volatile vinyl acetate is that this result suggests that if the temperature at the qualitative detection is consistent with the temperature of the production process el_Keylink` href=`http://Article/fenxi/200408/43.html`>, the result may be More scientific. A total of 4 toxic substances were detected in the qualitative fingerprint printing ink produced in Tianjin. The 2-methylbutanone with the highest peak area in the mass spectrometric total ion chromatogram was not detected in the air of the workplace, but the peak area followed by isopropyl was detected. alcohol. Therefore, the size of the peak area is difficult to determine the concentration of the air in the site, which may be the actual production process conditions are not completely consistent with the conditions of the qualitative analysis of the experimental environment.