GB/T 14501.6-2008Methods for analysis of uranium hexafluoride - Part 6: Determination of uranium (English PDF)

2.1 Method summary

UF6 samples (8-12) liquefied decimation achieved g, frozen in liquid nitrogen after hydrolysis, evaporated hydrolyzate (uranyl fluoride solution), then After high temperature hydrolysis into Triuranium, composed of eight three uranium oxide to obtain quality and potentiometric titration of the quality factor, calculated six UF uranium content.

2.2 Reagents and Instruments

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water.

2.2.1 Deionized water

2.2.2 Nitric acid solution, 1 + 1

2.2.3 hydrolysis temperature furnace, muffle furnace 3kW, lining 2mm thick nickel sheet (200mm × 115mm × 75mm), and with the steam generator and Connected to the condenser.

2.2.4 with cover platinum platinum boat, 100mL.

2.2.5 Platinum Baotou pliers

2.2.6 PTFE rod

2.2.7 tweezers, length 200mm, fluorine plastic header

2.2.8 Infrared lamp, 275W

2.2.9 Analytical Balance, indexing is 0.1mg.

2.2.10 Wrench, 250mm × 30mm

2.2.11 Oven

2.2.12 Bench vise, 75mm […]

2.3 Procedure

2.3.1 Platinum boat ready

2.3.1.1 Platinum boat (2.2.4) into the nitric acid solution (2.2.2) boiled 10min, then washed with deionized water (2.2.1) rinse.

2.3.1.2 Platinum boat into the high temperature hydrolysis furnace (2.2.3), and burned at 900 °C for 20min.

2.3.1.3 ignited after 40min weighed platinum boat cooling in a dryer, accurate to 0.1mg.

2.3.1.4 5min after weighing, weighing results if two adjacent difference is less than 0.2mg, record results of the second. Otherwise repeat weighing, Until two adjacent weighing result is less than 0.2mg. Platinum boat made of quality m1.

2.3.2 Hydrolysis sample, evaporated to dryness and burning

2.3.2.1 checking samples of uranium hexafluoride, if the sample is yellow, it indicates that the sample moisture, can not be used.

2.3.2.2 The sample tube containing a sample of uranium hexafluoride, into the fume hood standing with a gauze wipe the surface moisture and fixtures, home and dry The balance is more than 3h.

2.3.2.3 Weigh the sample containing uranium hexafluoride sample tube, accurate to 0.1mg, once every 30min said, until two adjacent weighing result