最近主管组织对作业指导书进行修改，发现有一个问题，如下： 旧作业指导书 参考标准 Canada Hazardous Products Act R.S.C.1985, c.H-3 Schedule I Part I Item9 样品处理：准确称取样品0.2g,精确至0.0001g。用c（HCl）等于5.0%（v/v）的盐酸溶液25ml与测试试样混合，使混合物避光,在温度为20℃时搅拌混合物10分钟。接着立刻将混合物中的固体物有效分离出来,先使用中速定性滤纸预过滤，再用孔径为0.45μm滤膜过滤器过滤，收集滤液于锥形瓶中。
现加拿大测试重金属标准最新版本为： Canada Consumer Products Safety Act SOR/2011-17 第23节 样品处理大概步骤： Method C03中 4.2 Transfer the removed coating to a mortar and grind the sample with a pestle. An electric grinder may be used when the sample is too difficult to grind with apestle and a mortar. Sieve the ground coating with a 500 :m sieve. The sample passing through the 500 :m sieve is then sieved through a 250 :msieve. The portion of the ground coating that passes the 500 :m and does not pass the 250 :m is used for the leaching test. Place the sieved portion in a weighing vessel and dry to constant weight (to the nearest 1 mg) in an air convection oven at 60°C ± 3°C. This may take about an hour. Record the drying time in the oven Log book and on the Results of Analysis data sheet. Remove the vessel from the oven and cool in a desiccator. 4.5 Dried coating 4.5.1 Transfer about 100 mg of the dried coating into a tared 100 mL beaker and weigh to the nearest 0.1 mg. Add 20 mL of the 5% (v/v) HCl leaching solution and immediately start stirring for 10 ± 1 minutes at 20°C ± 3°C with the use of digital shaker (speed 140) or a magnetic stirrer. At the end of the 10 ± 1 minutes, immediately filter the solution through a Whatman no. 40 filter paper in a funnel, into a 50 mL volumetric flask or certified 50 mL sample tube. Wash with a few mL of ultra-pure water, add 1 mL of concentrated nitric acid, and make up to volume with ultra-pure water. At least three replicate analyses should be performed on each coating sample. 4.9 Dilute the worked-up leachate solutions prepared in sections 4.5, 4.6, 4.7 ten times using 2% (v/v) nitric acid.
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