水中臭氧浓度的检测及三种液体中臭氧的稳定性  

Measurement of ozone concentration in water and stability of ozone in three liquids

作　　者：刘芬[1] 宋卫堂[2] 赵士铎[2] 许多武[3] 莫君毅[4] 王云红[3] 

机构地区：[1]中国农业大学工学院,北京100083 [2]中国农业大学理学院,北京100094 [3]中国农业大学水利与土木工程学院,北京100083 [4]中国农业大学食品科与营养工程学院,北京100083

出　　处：《农业工程学报》2005年第z2期125-128,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金："十五"国家科技攻关计划项目(2004BA521B01)

摘　　要：为了研究臭氧在水中的衰减行为,采用靛蓝二磺酸钠法和碘化钾法测定水中的臭氧浓度。其中靛蓝二磺酸钠法,在pH值2.0条件下,48 h内空白的吸光度降低了3%,含样品溶液的吸光度降低了40%;在pH值6.8条件下分别降低了1%和2%;在pH值11.9条件下分别降低了83%和52%。该法测定水中臭氧含量的应用条件仍需研究。用碘化钾法测定时发现,蒸馏水中臭氧浓度变化的总体趋势是衰减的,臭氧浓度在曝气停止后大约42 m in前后衰减速度不同,在42 m in以前衰减较快,之后一直到3h内基本稳定;自来水和营养液中60 m in内臭氧浓度变化的总趋势是稳定的,与蒸馏水中表现不同;3种液体中的臭氧浓度的高低顺序是:蒸馏水中(约15 m g/L)>自来水中(约10 m g/L)>营养液中(约3 m g/L)。To study the attenuation behavior of ozone in water,two methods were used to measure ozone concentration in water,indigo disulphonate spectrophotometry(IDS)and iodine titration method(ITM).The results of IDS were: when pH 2.0,the absorbency of black dropped by 3%,the absorbency of sample dropped by 40%;at pH(6.8),dropped by 1% and by 2%,respectively;at pH 11.9,dropped by 83% and by 52%,respectively;this implied that condition of this method used to measure the ozone concentration in water needed to be studied(further).The results of ITM were: the trend of the ozone concentration in distilled water was declining,and its speed before and after 15~42 min after ozonation was different;the trend of the ozone concentration in tap water and nutrition solution was steady,which was different with distilled water;The ozone concentration was: about 3 mg/L(in nutrition solution) <about 10 mg/L(in tap water) <about 15 mg/L(in distilled water).

关 键 词：臭氧 测定 靛蓝二磺酸钠法 碘化钾法 稳定性 

分 类 号：S317[农业科学—作物栽培与耕作技术]