微酸性电解水储藏和杀菌过程中有效氯衰减的动力学模型  

Decay kinetics model of available chlorine in slightly acidic electrolyzed water in storage and disinfection process

作　　者：和劲松[1] 祁凡雨[1] 叶章颖[1] 杨楠[1] 魏晓明[2] 朱松明[1] 

机构地区：[1]浙江大学生物系统工程与食品科学学院,农业部设施农业装备与信息化重点实验室,杭州310058 [2]农业部规划设计研究院设施农业研究所,北京100125

出　　处：《农业工程学报》2013年第15期263-270,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：浙江省重点科技创新团队计划(2011R09001);农业部公益性行业科研专项(201303091);浙江省公益性应用技术研究项目(2012C22075);浙江大学优秀青年教师资助计划(紫金计划)资助项目

摘　　要：为探明微酸性电解水(slightly acidic electrolyzed water,SAEW)在储藏及杀菌过程中理化指标的变化规律,将SAEW置于25、30、35、40、50℃环境温度下,测定其主要理化特性参数pH值、氧化还原电位(ORP),以及有效氯质量浓度(ACC)随储藏时间(0～12d)的变化,同时也测定了SAEW对大肠杆菌(ATCC25922)杀菌过程中ACC的变化规律。SAEW的pH值随储藏时间的延长而增大,ORP和ACC则减小,且储藏温度越高,各理化特性参数的变化幅度越大;在SAEW对大肠杆菌的杀菌过程中,ACC值不断降低。同时对储藏过程及杀菌过程中的有效氯衰减建立动力学模型,拟合后决定系数均达0.90以上。结果表明储藏温度和储藏时间对SAEW的理化特性参数有明显影响,且储藏过程与杀菌过程中的有效氯衰减符合一级动力学模型。相关研究结果为SAEW在农业、食品、医疗及环保等领域的应用提供了参考。Slightly acidic electrolyzed water （SAEW） with pH 5.0–6.5 is produced by electrolysis of dilute hydrochloric acid or salt solution in a chamber without membrane. SAEW can effectively kill various pathogenic bacteria as one of the most potential green disinfectants. However, SAEW is susceptible to be exposed to time, air, and illumination etc. To study SAEW during storage and disinfection, the variations of pH value, oxidation-reduction potential （ORP） and available chlorine concentration （ACC） were analyzed under different storage temperatures （25°C, 30°C, 35°C, 40°C, and 50°C） for 12 days. Furthermore, variations in ACC during Escherichia coli （ATCC 25922） disinfection were investigated. The results showed that the pH increased, but the ORP and ACC decreased during storage. When SAEW was stored in a transparent bottle at 25°C for 12 days, the ACC of SAEW was decreased from 20.53mg/L to 5.06mg/L, and the ORP of SAEW was also decreased from 821mv to 641 mv, while pH was increased from 6.06 to 7.45 in the same condition. Variations of ACC, ORP, and pH in a brown bottle under same stored temperatures had a similar tendency. When SAEW was stored in a brown bottle at 25°C for 12days, the ACC of SAEW was also decreased and the ORP of SAEW was decreased from 821mv to 652mv, while pH was increased from 6.06 to 7.38. The higher the stored temperature was, the quicker ACC, ORP, and pH of SAEW decayed during storage. SAEW was stored in a transparent bottle at 50°C for 12days, and the ACC of SAEW was decreased from 20.53mg/L to 0.10mg/L and the ORP from 821mv to 641mv, while pH was increased from 6.06 to 8.11 in the same condition. Similarly, when SAEW was stored in a brown bottle at 50°C for 12 days, the ACC of SAEW was decreased from 20.53mg/L to 0 and the ORP from 821mv to 583mv, while pH was increased from 6.06 to 8.03 in same condition. The same tendency of ACC was also found during E. coli disinfection, but the decay of ACC was quicker than it was presented during storage. The ACC of SAEW

关 键 词：动力学 模型 储藏 微酸性电解水 有效氯 杀菌 

分 类 号：S129[农业科学—农业基础科学]