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发表于 2013-3-25 19:21:54
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WHO TRS 957 附录4无菌制品
4.6.2 ……节选
For classifi cation purposes in grade A zones, a minimum sample volume
of 1 m³ should be taken per sample location. Referring to Table 1, for
grade A the airborne particle classifi cation is ISO 4.8 dictated by the
limit for particles ≥ 5.0 μm. For grade B (at rest) the airborne particle
classifi cation is ISO 5 for both particle sizes considered. For grade C (at
rest and in operation) the airborne particle classifi cation is ISO 7 and ISO
8, respectively. For grade D (at rest) the airborne particle classifi cation is
ISO 8. For classifi cation purposes ISO 14644-1 (2) methodology defi nes
both the minimum number of sample locations and the sample size based
on the class limit of the largest particle size considered and the method of
evaluation of the data collected. The sample volume should be determined
according to ISO 14644-1 (2) clause B.4.2. However, for lower grades
(grade C in operation and grade D at rest) the sample volume per location
should be at least 2 litres and the sample time per location should be not less
than 1 minute. There should not be less than 3 sample locations per room.
然而,对于洁净级别低一些的动态C级和静态D级,每点采样量应至少2升,采样时间应不少于1分钟。每个房间至少3个采样点。
GB16292-2010 中同时满足大小粒子的最少采样量是8.5L,现在用的至少都是28.3L的计数器了,照此标准,一般也是1分钟。
按照ISO14644-1,v=20/C5um*1000,计算出来A=1000L,B=690L,C=6.9L,D=0.69L, GMP附录一第九条也提到测试方法可参照ISO14644-1,所以照这个绝对没错。但综合考虑我们的传统习惯和仪器能力以及多采样数据更可信的原则,建议A/B级按公式计算,C/D级采1分钟(都大于等于标准的最小要求采样量)。 |
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