Rats were admin 2,4-dimethylphenol for 6 hr constantly by iv infusion or iv bolus injection. 2,4-Dimethylphenol was rapidly metabolized to its conjugates (94.3%) within 30 min; the glucuronide constituted 53% and other conjugates 41% /in plasma/.
HYDROXYLATION OF AROMATIC HYDROCARBONS WAS STUDIED FOLLOWING THEIR ORAL ADMINISTRATION TO RATS THAT ALSO RECEIVED A PURIFIED DIET CONTAINING NEOMYCIN TO REDUCE THE LEVELS OF NORMALLY OCCURRING SIMPLE URINARY PHENOLS. PHENOLIC METABOLITES WERE QUANTITATIVELY ESTIMATED IN HYDROLYZED URINE SAMPLES BY GAS CHROMATOGRAPHY. M-XYLENE ADMINISTERED AT A DOSE OF 100 MG/KG WAS METABOLIZED TO 2,4-DIMETHYLPHENOL TO THE EXTENT OF 0.9% OF THE DOSE GIVEN.
SUBJECTS WERE EXPOSED TO M-XYLENE AT CONCN OF ABOUT 3.9 MMOL/CU M FOR 5 DAYS, 6 HR/DAY. RATE OF 2,4-XYLENOL EXCRETION SHORTLY AFTER EXPOSURE WAS ABOUT 1-2% OF THAT FOR METHYLHIPPURIC ACID EXCRETION AND PULMONARY EXCRETION OF UNCHANGED XYLENE WAS ABOUT 4% OF UPTAKE.
The concn of 2,4-dimethylphenol was determined /in/ several tissues of the rat after 6 hr constant iv infusion and after iv bolus injection. 2,4-dimethylphenol was distributed rapidly in the brain and liver, /and had/ high tissue-plasma concn ratios for the brain, liver, and fat. Accumulation of 2,4-dimethylphenol in these tissues was negligible.
FOLLOWING IV ADMIN OF 17 MG/KG OF THE 2,4-ISOMER TO RATS, THE BRAIN ACCUMULATED THE HIGHEST AMT ON A PER G BASIS, FOLLOWED BY FAT AND LIVER. RATIOS OF BRAIN, LIVER AND FAT TO PLASMA /CONCN/ WERE APPROX 1, 1.5 AND 2, RESPECTIVELY.
2,4-DIMETHYLPHENOL DISTRIBUTED RAPIDLY THROUGH THE BODY AFTER IV BOLUS ADMIN OF 30 MG/KG. PLASMA, LIVER AND FAT CONCN DISAPPEARED PRIOR TO 60 MIN BUT PERSISTED IN THE BRAIN.
来源:Hazardous Substances Data Bank (HSDB)
吸收、分配和排泄
在焦化设施工业中,研究了邻甲酚、间甲酚、对甲酚、2,4-二甲酚、2,5-二甲酚、3,4-二甲酚和3,5-二甲酚的暴露水平与尿中酚排泄量之间的关系。研究对象包括从事焦油蒸馏过程的76名暴露工人和34名对照组。... 尿液代谢物水平根据比重和肌酐进行了校正。焦油蒸馏工人的呼吸区域的时间加权平均暴露浓度... 对于二甲酚为0.02至0.04 mg/立方米。... 暴露工人的尿中二甲酚水平范围为0.12至0.97 mg/l,经过比重校正。在对照组尿样中,比重校正后的二甲酚浓度范围为25 x 10(-3)至43 x 10(-3) mg/l。观察到环境水平与尿中酚、邻甲酚和二甲酚浓度之间存在显著相关性,相关系数范围为0.45至0.82。作者结论,尿中二甲酚的生物监测可能用作衡量焦化设施工人二甲酚暴露的一种方法。
Associations between o-cresol, p-cresol, m-cresol, 2,4-xylenol, 2,5-xylenol, 3,4-xylenol, and 3,5-xylenol exposure levels and urinary phenol excretion were examined in the coke facility industry. The subjects consisted of 76 exposed workers employed in the tar distillation process and 34 controls. ... Urinary metabolite levels were corrected for specific gravity and creatinine. The time weighted average exposure concentrations in the breathing zones of the tar distillation workers were ... 0.02 to 0.04 mg/cu m for xylenols. ... The urinary xylenol levels of exposed workers ranged from 0.12 to 0.97 mg/l with specific gravity correction. In control urine samples, the specific gravity corrected xylenol concentrations ranged from 25 x 10(-3) to 43 x 10(-3) mg/l. Significant correlations were observed between the ambient levels and urinary concentrations of phenol, o-cresol, and the xylenols, with coefficients ranging from 0.45 to 0.82. The author concludes that the biological monitoring of urinary xylenols may be used as a means of measuring xylenol exposure in coke facility workers.
1.周国泰,化学危险品安全技术全书,化学工业出版社,1997 2.国家环保局有毒化学品管理办公室、北京化工研究院合编,化学品毒性法规环境数据手册,中国环境科学出版社.1992 3.Canadian Centre for Occupational Health and Safety,CHEMINFO Database.1998 4.Canadian Centre for Occupational Health and Safety, RTECS Database, 1989