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       <h1 class="ny_newsdetail_title">玻碳电极的维护保养</h1>
       <div class="ny_newsdetail_tips">更新时间：2021-11-06&nbsp;&nbsp;|&nbsp;&nbsp;点击率：3608</div>
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          <div>　　<strong>玻璃碳</strong>简称玻碳，是将聚丙烯腈树脂或酚醛树脂等在惰性气氛中缓慢加热至高温处理成外形似玻璃状的非晶形碳，适于作电极的电子导体材料，在乒乓球底板中也被广泛使用。<br />&nbsp;</div><div>　　a.<strong>玻碳电极</strong>抛光：现在1.0微米的磨料上磨，然后在0.05微米的磨料上抛光，然后转移到乙醇和去离子水中超声。超声时间一般不要超过半小时。<br />&nbsp;</div><div>　　因玻碳电极是惰性电极，所以在使用镀扫描材料就是扫描电极，如镀汞，铜，金就是汞膜，铜膜，金膜电极。例如：阳极溶出镀汞和镀金，玻碳镀汞有两种：*种为同位镀汞，即在被分析的样品中加入一定量的Hg+(一般用氧化汞和硝酸汞)在电解富集待离子的点位下，同时形成汞齐，扫描溶出后，于较正的电位下，*溶出待测离子或汞膜，还可以取出电极用滤纸把汞膜擦净。保证第二次分析时电极表面仍然为原始状态，以保证重现性，一般汞离子的浓度是被测离子浓度的500-1000倍，第二种为预镀汞膜：<br />&nbsp;</div><div>　　1.在正于待测离子电解电位下长时间电积汞。如测Cu可在-0.2V长时间电积制得汞膜，而防止电积Cu,Pb,Cd,Zn的危险，此方法效率低，时间长。<br />&nbsp;</div><div>　　2.在同位镀汞条件下，电极制作一段时间后，扫描溶出，在终止电位下再溶出一般时间，溶出待测离子，如此富集-溶出，反复数次即可得到一层不含待测离子的汞膜。<br />&nbsp;</div><div>　　b.必须保证玻碳表面呈镜面和清洁。由于玻璃炭表面容易受到一些有机物金属化合物的污染，严重地影响测量(不出峰，出杂峰，不重现)所以测量前都必须作清洁处理，主要方法有三种，化学法<br />&nbsp;</div><div>　　1.硝酸浸泡和擦洗。<br />&nbsp;</div><div>　　2.以氨水无水乙醇或乙酸乙脂1：1浸泡擦洗。<br />&nbsp;</div><div>　　3.也可用酒精擦洗后再以6NHCL或4NHO3浸泡。电化学处理：即在+0.8V-(-1.8V(0.5MKcLPH7除O2I条件下)电压范围内反复极化次(复位-扫描)(阳极-阴极至阴极处)若严重污染和有麻坑，划痕可作机械处理，MgO粉(200目以上)放在湿绒布上，加少量水抛光。也可根据电极情况把几种方法联合使用。不宜长时间将电极浸泡再强酸强碱和有机溶剂中。</div>
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