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181.
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Paramalinggam Thanalechumi Zulkifli Yusop 《Journal of environmental science and health. Part. B》2019,54(4):294-302
A newly developed electrochemical sensor for chlorothalonil based on nylon 6,6 film deposited onto screen printed electrode (SPE) with electrochemical modulation of pH at the electrode/solution interface was studied for the first time. Differential pulse cathodic stripping voltammetry (DPCSV) was used to carry out the electrochemical and analytical studies. Experimental parameters such as accumulation potential, initial potential, accumulation time and pH of Britton-Robinson buffer have been optimized. Chlorothalonil gave optimum analytical signal in a medium of 0.04?M Britton-Robinson buffer at pH 6.0. A well-defined reduction peak was observed, at Ep= ?0.851 and ?0.938?V vs. Ag/AgCl (3.0?M KCl) for both bare SPE and modified SPE, respectively. The peak currents of modified SPE were significantly increased as compared to bare SPE. At the modified SPE, a linear relationship between the peak current and chlorothalonil concentration was obtained in the range from 0.1 to 2.8?×?10?6?M with a detection limit of 1.53?×?10?8?M (S/N=?3). The practical applicability of the newly developed method has been demonstrated on analyses of real water samples. The newly developed sensor shows good reproducibility with RSD of 3.92%. The nylon 6,6 modified SPE showed itself as promising sensor with good selectivity for chlorothalonil determination. 相似文献
183.
池莉 《环境保护与循环经济》2021,41(1):32-34
废线路板的稀贵金属含量较高.论述了废线路板中金的提取方法,分为全部浸出工艺和选择性浸出工艺,并提出了稀贵金属的提取工艺流程. 相似文献
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Recycling of WEEE: characterization of spent printed circuit boards from mobile phones and computers 总被引:3,自引:0,他引:3
Yamane LH de Moraes VT Espinosa DC Tenório JA 《Waste management (New York, N.Y.)》2011,31(12):2553-2558
This paper presents a comparison between printed circuit boards from computers and mobile phones. Since printed circuits boards are becoming more complex and smaller, the amount of materials is constantly changing. The main objective of this work was to characterize spent printed circuit boards from computers and mobile phones applying mineral processing technique to separate the metal, ceramic, and polymer fractions. The processing was performed by comminution in a hammer mill, followed by particle size analysis, and by magnetic and electrostatic separation. Aqua regia leaching, loss-on-ignition and chemical analysis (inductively coupled plasma atomic emission spectroscopy - ICP-OES) were carried out to determine the composition of printed circuit boards and the metal rich fraction. The composition of the studied mobile phones printed circuit boards (PCB-MP) was 63 wt.% metals; 24 wt.% ceramics and 13 wt.% polymers; and of the printed circuit boards from studied personal computers (PCB-PC) was 45 wt.% metals; 27 wt.% polymers and ceramics 28 wt.% ceramics. The chemical analysis showed that copper concentration in printed circuit boards from personal computers was 20 wt.% and in printed circuit boards from mobile phones was 34.5 wt.%. According to the characteristics of each type of printed circuit board, the recovery of precious metals may be the main goal of the recycling process of printed circuit boards from personal computers and the recovery of copper should be the main goal of the recycling process of printed circuit boards from mobile phones. Hence, these printed circuit boards would not be mixed prior treatment. The results of this paper show that copper concentration is increasing in mobile phones and remaining constant in personal computers. 相似文献
186.
分别在管式炉反应器和热天平上对废电路板的热解行为进行实验研究。在管式炉反应器上考察了在同一升温速率(20 K/min)下不同热解终温 (400、500、600、700和800℃) 对废电路板热解产物产率的影响。在相关实验数据的基础上尝试用灰色理论及方法建立基于热解终温的废电路板热解灰色产率预测模型GM(1,1),预测结果与实验数据对比表明,该预测模型精度较高,能够较好地对不同热解终温下废电路板热解产物产率进行预测。此外,在热天平上获得的不同升温速率(10、15和20 K/min)下的热失重曲线表明,废电路板的失重速率峰随升温速率的提高逐渐向高温侧移动。采用分布活化能模型对废电路板热失重曲线进行动力学分析,获得废电路板热解活化能的变化曲线。计算结果表明,废电路板热解过程中活化能并不是单一数值,而是随失重率变化的一个函数。所得废电路板热解活化能值在140~250 kJ/mol范围内变化,当失重率在10%~60%之间,活化能值总体呈缓慢上升的趋势,但当失重率>60%时,活化能值由155.4 kJ/mol迅速增加到244.4 kJ/mol。 相似文献
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188.
针对目前配电箱开关在火灾热影响下由于脱扣机构动作引起跳闸,不能保证消防设备供电问题,经过对消防配电箱的火灾试验研究,分析了外部热源对开关动作的影响。通过线损量的计算,得出了火灾情况下环境温度与电阻热损耗的关系。并依据双金属片热弯曲理论,推导出热脱扣机构动作力与端部位移成正比的关系。总结出消防终端设备开关热过载保护应仅用于动作信号而不应切断电源的结论。对于现有消防配电柜,给出了通过调整开关热脱扣机构倾斜角,来增加消防负荷的供电时间的方案,可以为消防供电系统断路器的可靠性设计作参考。 相似文献
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印制电路板废水处理技术应用实践 总被引:3,自引:0,他引:3
针对印制电路板废水的特点,根据清污分流、先预处理再综合处理的原则进行合理的细化分类,对不同的水质进行分类物化处理。该处理技术具有工艺合理、可操作性好、自动化程度高等优点,处理后出水水质达到广东省《水污染物排放限值》(DB44/26—2001)一级标准。 相似文献