Altun Şükran, Kadak Ali Eslem, Küçükgülmez Aygül, Gülnaz Osman, Çelik Mehmet
Institute of Natural and Applied Sciences, Çukurova University, 01330 Adana, Turkey.
Fisheries Faculty, Kastamonu University, 37150 Kastamonu, Turkey.
Toxicol Res. 2022 Oct 31;39(1):127-133. doi: 10.1007/s43188-022-00152-2. eCollection 2023 Jan.
In this study, the adsorption of toxic difenoconazole pesticide was investigated by using chitosan. In the first phase of the study, chitosan was extracted from deep-water pink shrimp () shells, by deacetylation of the chitin, which is separated and disposed of after meat extraction in processing facilities in Turkey. The deacetylation degree, molecular weight, viscosity, moisture, and crude-ash values of the extracted chitosan were determined. Chitosan, having a high deacetylation degree (90.21%), was used as the adsorbent. In the second phase of the study, the effects of pH, temperature, and pesticide concentration on the adsorption were investigated. The optimum pH level for pesticide adsorption was determined as 5. It was observed that the adsorption increases as the temperature increases. A rapid increase was observed within the first 5 min of the 60-minute adsorption process in difenoconazole concentrations of 5, 15, and 25 µg/L, and after 10 min, the adsorption rate was stable. The Langmuir isotherm parameters regarding the adsorption were determined as aL = 0.635, kL = 15.10, and the Q value was calculated as 23.77 mg/g. In the evaluation of overall study results, it was determined that the chitosan biopolymer is a suitable adsorbent for difenoconazole pesticide adsorption.
在本研究中，使用壳聚糖对有毒的苯醚甲环唑农药吸附情况进行了研究。在研究的第一阶段，壳聚糖是从深水粉虾（）壳中提取的，通过对几丁质进行脱乙酰作用得到，几丁质是在土耳其的加工设施中提取虾肉后分离并丢弃的。测定了提取的壳聚糖的脱乙酰度、分子量、粘度、水分和粗灰分含量。使用脱乙酰度高（90.21%）的壳聚糖作为吸附剂。在研究的第二阶段，研究了pH值、温度和农药浓度对吸附的影响。确定农药吸附的最佳pH值水平为5。观察到吸附量随着温度的升高而增加。在60分钟吸附过程的前5分钟内，5、15和25μg/L的苯醚甲环唑浓度下吸附量迅速增加，10分钟后吸附速率稳定。关于吸附的朗缪尔等温线参数确定为aL = 0.635，kL = 15.10，Q值计算为23.77mg/g。在对整体研究结果的评估中，确定壳聚糖生物聚合物是苯醚甲环唑农药吸附的合适吸附剂。
