资料摘要
资料下载This is similar to the method in the Criteria Document [3] and P&CAM 259 [4] which has been collaboratively tested [1]. This method is similar, except for sample collection, to S315 [5,6]. Method P&CAM 109 [7,8,9], which incorporates an internal standard, has been dropped. XRD can distinguish the three silica polymorphs and silica interferences can be eliminated by phosphoric acid treatment. IR (methods 7602 and 7603) can also quantify quartz, cristobalite and tridymite if amorphorous silica and silicates are not present in large amounts. However sensitivity is reduced if multiple polymorphs are present and secondary peaks must be used. Crystalline silica can also be determined by visible absorption spectrophotometry (e.g., Method 7601), but polymorphs can not be distinguished. Visible absorption methods also have larger laboratory-to-laboratory variabilty than XRD and IR methods and therefore are recommended for research use only [10].
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简介：Multi Tube Vortex Mixer offers high capacity vortexing up to 2500rpm. The digital vortex mixer can hold 60 x 7 mL blood tubes to 6 x 250 mL flasks.
NIOSH9000纯银微孔滤膜过滤X射线衍射法测定空气中的石棉和温石棉
简介：Antigorite (massive serpentine), Chlorite, Kaolinite, Bementite, and Brushite interfere. X-ray fluorescence and absorption is a problem with some elements; fluorescence can be circumvented with a diffracted beam monochromator, a nd absorption is corrected for in this method.
NIOSH7506纯银微孔滤膜过滤X射线衍射法测定空气中的碳化硼
简介：The working range is 0.2 to 4 mg/m 3 for a 500-L air sample. The method is specific for determining respirable boron carbide among other mine dusts.
NIOSH7505纯银微孔滤膜过滤X射线衍射法测定空气中的硫化铅
简介：The working range is 0.06 to 4 mg/m 3 for a 500-L air sample. The method is specific for lead sulfide among other mine dusts.
NIOSH7504纯银微孔滤膜过滤X射线衍射法测定空气中的钒的氧化物
简介：The working range is 0.2 to 4 mg/m 3 (as V) for a 500-L air sample. The method will determine V 2 O 5 , V 2 O 3 , and NH 4 VO 3 separately on the same sample.
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