数字式三用电表项目投资备案报告.docx
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1、beaker as in 13.1.1.Add35 mL HNO3(1+1), cover with a watch glass, and heat gentlyuntil dissolution is complete and oxides of nitrogen aredispelled. Cautiously add 10 mL of HClO4and continueheating (see Note 6). Evaporate to dense white fumes. Con-tinue fuming to near dryness.NOTE 6Handle HClO4in acc
2、ordance with practices E50 as follows:HClO4can be used safely, but only under carefully prescribed conditions.Dilute HClO4has the same hazardous properties as other strong acids, butthe concentrated acid, especially when it is hot, reacts rapidly and oftenwith violently explosive force with oxidizab
3、le materials. Only well-established procedures should be employed for HClO4oxidations and theprocedures should be followed exactly as written. Specially designedhoods are specified for handling HClO4fumes and any hood in whichHClO4may be fumed should not be used for other operations that permiteasil
4、y oxidizable material to collect in the ducts or blower.13.1.3.2 Cool slightly and dissolve salts in 35 mL HC1(1+3). Heat to boiling. Allow to cool again. Rinse watch glassand beaker with HC1 (1+3) and filter through a dry, highwet-strength, medium- porosity filter paper4into a volumetricflask. Wash
5、 the paper eight times with HC1 (1+3) and discardthe paper. Dilute to volume with HCl (1+3) and mix.13.2 Prepare a reagent blank by treating the same amount ofall reagents as directed in 13.1.2 or 13.1.3. Use reagents fromthe same lots for blank and test solutions.13.3 MeasurementUsing water as a ze
6、ro reference, aspi-rate calibration standards alternately until stable readings occur(within 2 %). Alternate readings: three samples, a standard,three samples and another standard, etc., until the absorbancefor all samples and standards have been determined at least4Whatman No. 54 or No. 541 has bee
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