3, 4- dinitro-furazan-based oxidation furazan acute and subchronic toxicity studies / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To study the 3, 4- dinitro-furazan-based oxidation furazan (DNTF) of sub-acute toxicity and chronic toxicity, to determine the acute toxicity classification DNTF, the nature of toxic effects and major target organ for the development provide the basis for occupational exposure limits.</p><p><b>METHODS</b>( 1) Acute toxicity: The oral gavage method once infected, symptoms of poisoning of animals observed to calculate the LD50DNTF and 95% confidence limits. ( 2) sub-chronic experiment: selection of 96 healthy SD rats were randomly divided into four groups, doses of 25, 56.2, 125 mg/kg and the negative control group, Exposure for ninety days,five days a week, once a day, The rats were killed at end of Exposure, heart, liver, spleen, lung, kidney, brain,testis, uterus were taken to observe the pathological changes.</p><p><b>RESULTS</b>( 1) Acute oral toxicity test results indicate that DNTF rat oral LD50 greater than 5000 mg/kg, DNTF mice treated by oral LD50 4589 mg/kg, 95%confidence limit for the 4026-5230 mg/kg, Acute toxicity grade level is low toxicity compounds. (2) Sub-chronic toxicity experiment, the high-dose male rats, high, medium and low-dose group female rats weight gain than the negative control group, compared with the control group, the difference was statistically significant (P<0.05).125 mg/kg of serum alanine aminotransferase, aspartate aminotransferase was significantly higher. 125 mg/kg dose groups, liver, kidney, lung, testicular factor was significantly higher. Liver, kidney, lung histological examination showed obvious morphological changes.</p><p><b>CONCLUSION</b>Acute toxicity grade DNTF low toxicity level compounds, target organ toxicity of liver, kidney and lung.</p>

Teratogenicity of 3, 4 two furazan-based oxidation furazan in rats / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To study the teratogenicity of new high-energy compounds, 3, 4 two furazan-based oxidation furazan (DNTF) and the impact on human health, occupational exposure limits were provided for the following research.</p><p><b>METHODS</b>Pregnant SD rats were randomly divided into five groups by Standard teratogenicity test, including three dose groups (5.0, 15.8, 50.0 mg/kg), the negative control (vegetable oil), and the positive control group (CP 10.0 mg/kg). Each 10 to 15 rats were in one group. Gavage was consecutive for rats during pregnancy 7 ∼ 12 d and then sacrifice after 20 d.</p><p><b>RESULTS</b>There were no significantly difference between the three dose groups and negative controls in the pregnancy rate, the weight of pregnant rats, fetal weight, fetal growth, fetal malformation rate and internal organs,</p><p><b>CONCLUSION</b>There were no maternal toxicity, embryo toxicity and teratogenicity for rats when DNTF in the range 5.0 ∼ 50.0 mg/kg.</p>

A coal mine and coal preparation plant coal dust workplace present situation investigation and analysis / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>Through a detection of dust in the coal mines workplace, to understand the status of occupational hazards, and the evaluation of occupational hazards, provide subject to control occupational hazards.</p><p><b>METHOD</b>According to production process and "hazardous substances in workplace air monitoring, sampling norms" and other standards to determine the sampling points and sampling of coal dust.</p><p><b>RESULT</b>Underground mining operations in 21 subjects with time-weighted average concentration of dust types pass rate of 28.6%, of which five types of dust hazard grade II, six types of dust hazard rating of 0, and the remaining types of grade I dust hazard levels. Coal dust test six types of time-weighted average concentration of 83.3% pass rate, only one types of dust hazard grade I, all the rest is 0. Calculated by the detection of dust overrun 18 times operating sites, the pass rate of 72.2% results.</p><p><b>CONCLUSION</b>Purified water spray and air flow curtain of dust control has played a certain role, but the work of underground working conditions and environmental constraints, most of the dust concentration in workplace occupational exposure limits do not meet the requirements, recommended the strengthening of dust or Dust the daily management and maintenance of equipment, strengthen the ventilation, personal protection officers to strengthen operations.</p>

Study on acute and subchronic toxicity of ammonium dinitramide / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To study the acute, subacute and subchronic toxicity induced by ammonium dinitramide (ADN), and to ascertain the gradation and target organs of acute toxicity induced by AND.</p><p><b>METHODS</b>According to technical specifications for toxicity determination of chemicals, the oral tests for acute, subacute and subchronic toxicity induced by AND were performed for 90 days.</p><p><b>RESULTS</b>The oral LDx for mouse and rat was 568.9 mg/kg and 616.6 mg/kg ADN respectively. The gradation of acute toxicity induced by AND was low level. The results of oral subacute and subchronic toxicity tests (for 28 and 90 days) showed that a gain in weight in group exposed to 123 mg/kg AND was significantly lower than that in control group (P<0.05), the TBIL and ALT in group exposed to 61.6 and 123 mg/kg AND significantly increased and the ratio of liver weight to body weight obviously decreased, as compared with control group, the number of animals with hepatic pathological changes in group exposed to 61.6 and 123 mg/kg AND was significantly higher than that in control group (P<0.05).</p><p><b>CONCLUSION</b>The gradation of acute toxicity induced by ADN was low level. When the exposure dose of AND was 30.8 mg/kg, the adverse effect was not observed, and the target organ was liver.</p>

Study on mutagenicity and teratogenicity of ammonium dinitramide / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To study the mutagenicity and teratogenicity induced by ammonium dinitramide(ADN).</p><p><b>METHODS</b>According to technical specifications for toxicity determination of chemicals, Salmonella typhimurium reverse mutation assay (Ames assay), in vivo mammalian erythrocyte micronucleus test, sperm malformation test and teratogenesis test were used to detect the mutagenicity and teratogenicity induced by AND.</p><p><b>RESULTS</b>When the exposure doses of AND were 8-5000 pg/plate, the result of Ames assay was negative. As compared with control group, the micronucleus rate of mice exposed to 113.8 mg/kg AND significantly increased(P<0.05), the sperm malformation rates of mice exposed to 54.4-272.0 mg/kg AND did not increased significantly. The survival rate of fetuses decreased, the rate of assimilated fetuses increased, the rate of fetus sternum agenesis enhanced in mice exposed to 319 mg/kg AND, as compared with controls. The rates of in the 4th-6th fetus sternum agenesis in groups exposed to 21.3, 79.7 and 319 mg/kg AND were higher than that in control group. The malformation rate of fetus bowels in groups exposed to 319 mg/kg AND was higher than that in control group. The teratogenic index of ADN was 30.</p><p><b>CONCLUSION</b>AND may be a mutagen and induce the teratogenic effect.</p>