[Determining the level of yttrium oxide-coated silicon nitride in the air of the work area].
To measure the concentrations of yttrium-oxide-coated small-dispersed silicon nitride plasma powder, the air was aspirated at the amount of 10-15 litres per min through the AFA-XP filter. The filter was limed in a platinum crucible, the residuum being alloyed with Na2CO3, Na2B4O7, NaNO3 in ratio 10:5:1. The alloy was transferred into solution in which the silicon content was assessed through reactions with ammonium molybdate, and yttrium--through reactions with arsenaso III. The sensibility rate for silicon was at 0.07 mg/m3.
Makeeva
E P
EP
Baranov
V I
VI
Krivda
G I
GI
D000395:Air Pollutants, Occupational / Q000032:analysis / Q000633:toxicity*; D002617:Chemical Industry / Q000592:standards*; D005374:Filtration / Q000379:methods; D006801:Humans; D008452:Maximum Allowable Concentration; D010783:Photometry / Q000379:methods; D012825:Silicon / Q000032:analysis / Q000592:standards / Q000633:toxicity*; D017655:Silicon Compounds; D014586:USSR; D015019:Yttrium / Q000032:analysis / Q000592:standards / Q000633:toxicity*
D000395:Air Pollutants, Occupational; D017655:Silicon Compounds; D015019:Yttrium; C032734:silicon nitride; D012825:Silicon
OPredelenie nitrida kremniia, pokrytogo pksidom ittriia, v vozdukhe rabocheĭ zony.