ABSTRACT
In this paper repored the study of the sanitary standard for Methylmercaptan in amdient air.The content include the collecting of toxicological information,the experiment of odor thershold and the investigation of Methylmercaptan pollut ion as well as efffect of offensive odor pollution on the residents,For preventing from dete-riation of the sense organ properties of air,the threshold is the restrictive index,Ac-cordingiy the Marium permission con cen-tration for air methylmercapt an in residential area is 0.7?g/m3 be suggested.
ABSTRACT
In order to explore the effects of printing and dyeing wastewater untreated and treated by bacterial biotechnological method on the specific immune response of Carassius auratus, the tested fish were preimmunized intraperitoneally with Aeromonas hydrophila vaccine then were separately placed into control clean water,untreated printing and dyeing wastewater (dilution ratio 13%,pH=7) and treated water 5 fish of every group were killed on the day 2,4,6,8,10,14,18,25,35 th to detect their immune indexes The results indicated that total leucocytic numbers of blood and serum lysozyme level in fish of clean water and treated water increased rapidly and reached their peaks on the day 8th and 6th respectively after vaccination,then reduced to baseline and maintatined for a period of time Leucocytic numbers in fish in untreated wastewater group decreased on day 2nd then increased gradully to normal,serum lysozyme level in this group had decreasing tendency and was lower than the other 2 groups from beginning to end However titer of anti A hydrophila antibody in serum of untreated water group was only lower than that of treated water group on the day 6th when it appeared After this antibody titers of these 3 groups had no significant defference It indicated that printing and dyeing wastewater inhibited immune response of Carassius auratus ,but water treated by bacterial biotechnological method had no this kind of toxic effect