Standard Practice for Ammonium Bifluoride and Nitric Acid Digestion of Airborne Dust and Dust-Wipe Samples for the Determination of Metals and Metalloids

10.1520/d8344 ◽  
2020 ◽  
Author(s):  
Keyword(s):  
Nitric Acid ◽  
Acid Digestion ◽  
Metals And Metalloids ◽  
Airborne Dust ◽  
Standard Practice ◽  
Ammonium Bifluoride ◽  
Nitric Acid Digestion

Determination of Biomass in Activated Sludge Containing Large Quantities of Carbonaceous Solid Carriers

1988 ◽  
Vol 23 (2) ◽  
pp. 279-291 ◽  
Author(s):  
PR. Senthilnathan ◽  
J. J. Ganczarczyk
Keyword(s):  
Nitric Acid ◽  
Activated Sludge ◽  
Suspended Solids ◽  
Reliable Estimate ◽  
Acid Digestion ◽  
Carbonaceous Particles ◽  
Mixed Liquor ◽  
Digestion Technique ◽  
Nitric Acid Digestion

Abstract The exact estimation of biomass in the presence of carbonaceous carriers is an unresolved problem. Inaccuracy arises from the use of mixed liquor volatile suspended solids (MLVSS) determination as the measure of biomass, due to the volatilization properties of some carrier particles at 550°C. Problems are also associated with the differential ignition technique and nitric acid digestion technique, which are used instead of the MLVSS determination. Therefore, a method of calculating the biomass content by the determination of nitrogen in the mixed liquor suspended solids is proposed. In this paper, the proposed method is compared with the differential ignition technique. The Nitric acid digestion technique was not used in this study due to the explosive nature of one of the carbonaceous carriers when digested with nitric acid. It was found that calculation based on the nitrogen analysis gave a more reliable estimate of biomass in systems containing carbonaceous particles than the differential ignition technique.

Greening microwave-assisted acid digestion of animal feed samples

2019 ◽  
Vol 11 (46) ◽  
pp. 5857-5863 ◽  
Author(s):  
Marianela Savio ◽  
Lucimar L. Fialho ◽  
Joaquim A. Nóbrega
Keyword(s):  
Nitric Acid ◽  
Green Chemistry ◽  
Animal Feed ◽  
Acid Digestion ◽  
Microwave Assisted ◽  
Nitric Acid Digestion ◽  
Recycle And Reuse ◽  
Feed Samples ◽  
Dilute Nitric Acid

The combination of dilute nitric acid digestion followed by recovery of the acid digests, represents steps towards green chemistry approaches: “reduce the use, recycle and reuse”, strictly following the major green chemistry recommendations.

Sign in / Sign up

Export Citation Format

Share Document