主题：【讨论】荧光灯中整体含汞量的测定

2002/747/EC

原文由 lotus_sum 发表:
2002/747/EC

里面没有说明具体怎么测试啊？

The test method for the mercury content is as follows. The arc tube is first separated from its plastic surrounds and associated electronics. The associated leadwires are cut as close to the glass seal as possible. The arc tube is taken to a fume cupboard and is cut into segments. The segments are placed in a suitably sized robust screw-capped plastic bottle to which is added a 1 inch diameter porcelain ball and 25 ml of high purity concentrated nitric acid (70 %). The bottle is sealed and shaken for a few minutes to reduce the arc tube to fine particle size, the stopper is periodically loosened to eliminate any possibility of pressure build-up. The contents of the bottle are allowed to react for 30 minutes during which time the contents are periodically agitated. The contents of the bottle are then filtered through an acid resistant
filter paper and collected in a 100 ml graduated volumetric flask. Potassium dichromate is then added to the flask so that the final concentration is 1 000 ppm with respect to chromium. The flask is then made up to volume with pure water. Matched standards are made up on a concentration range up to 200 ppm mercury. The solutions are analysed using flame atomic absorption at a wavelength of 253,7 nm with background correction on. From the results obtained and knowledge of the solution volume, the original mercury content of the light bulb can be computed. The competent body may agree adaptations to the details of this test method if they are necessary for technical reasons, and these shall be applied in a consistent manner

原文由 hyf271 发表:

原文由 lotus_sum 发表:
2002/747/EC

里面没有说明具体怎么测试啊？

指令内容中有，请详细阅读！

塑料管应该怎么选呢？灯的大小有不同，有荧光灯中汞前处理的装置不？谢谢

整个灯管除金属及塑料件电子元件外都要溶解的话,有些大灯管(直径38mm长度1300)处理可就困难了!

环境标志产品技术要求 节能灯
HJ/T 230-2006
代替HJBZ 15.1-1997
    HJBZ 15.2-1997
附录A
(规范性附录)
汞含量测定方法
标准中所指的汞含量应为平均含量。在测试中应对10 个样品进行测试，并去除一个最
大值和一个最小值，并计算出余下八个数值的算术平均值，即为最终结果。
汞含量的测定方法如下所述：首先去一只灯将其发光管与其周边的塑料部件和金属部件
分离，尽可能地靠近玻璃处截断灯管和导线。将切割后的碎片放入尺寸合适的永久固定的塑
料瓶中，该塑料瓶中装有直径25mm 左右的陶瓷小球和25ml的高纯浓硝酸（70%）。将瓶口
密封并振荡若干分钟，使发光管碎片被研磨为细颗粒，在这过程中需要松动瓶盖以减小可能
产生的压力。然后让混合物反应30分钟，并定时摇晃瓶中物质。将瓶中溶液通过防硝酸滤纸
收集到100ml的带有刻度的烧瓶中。将高铬酸钾加入烧瓶中，使铬的最终浓度达到1000ppm。
烧瓶中加纯水使其达到一定体积。
应得的汞浓度范围最高可达200ppm。
而后在开启背景校正的状态下，以波长253.7nm 火焰原子吸收光谱对溶液进行分析。通
过测得的结果和溶液的体积，便可计算出灯泡中初始的汞含量。

探讨一下，测汞用火焰原子吸收光谱进行检测？标准换了之后，检测方法也由冷原子法换成火焰原子光谱来检测了。

我根据2002/747/EC指令的前处理让汞反应到溶液中，不加入高氯酸钾，可以用ICP来检测吗？谢谢

我已经可以买到2.2L的特富龙广口瓶里。有盖子，可以方便进行处理。

2.2L的特富龙广口瓶

刚刚忘了上传它的一些资料！