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.

Microwave-assisted nitric acid digestion of organic matrices

1998 ◽  
Vol 8 (3) ◽  
pp. 93-94 ◽  
Author(s):  
Irina V. Kubrakova ◽  
Andrei A. Formanovsky ◽  
Tamara F. Kudinova ◽  
Nicolai M. Kuz’min
Keyword(s):  
Nitric Acid ◽  
Acid Digestion ◽  
Microwave Assisted ◽  
Organic Matrices ◽  
Nitric Acid Digestion

Microwave-Assisted Vapor-Phase Nitric Acid Digestion of Small Biological Samples for Inductively Coupled Plasma Spectrometry

1998 ◽  
Vol 52 (6) ◽  
pp. 900-907 ◽  
Author(s):  
Dula Amarasiriwardena ◽  
Antoaneta Krushevska ◽  
Ramon M. Barnes
Keyword(s):  
Nitric Acid ◽  
Vapor Phase ◽  
Biological Samples ◽  
Inductively Coupled Plasma ◽  
Closed Vessel ◽  
Acid Digestion ◽  
Inductively Coupled ◽  
Microwave Assisted ◽  
Microwave Apparatus ◽  
Nitric Acid Digestion

The applicability of microwave-assisted, vapor-phase nitric acid digestion of small biological samples in closed-vessel microwave systems is examined for the inductively coupled plasma atomic emission spectroscopy (ICP-AES) determination of 10 elements (Al, As, Ca, Cu, Cd, Fe, Mn, Mo, Pb, and Zn). A 1.8 mL quartz sample container geometry was optimized for the successful decomposition of 50 to 90 mg of powdered biological samples. Microwave energy was efficiently coupled by addition of 250 μL of distilled deionized water to the sample. A single microwave-assisted, vapor-phase acid sample digestion was accomplished within 30 min (including cooling time) at ∼1200 psi pressure and 450 W microwave power in a commercial pressurized microwave decomposition (PMD) system. Multiple microwave-assisted, vapor-phase acid digestions were achieved at moderately high pressure (400 to 480 psi) and 230 °C with a second closed-vessel microwave apparatus. The results for 10 elements in biological standard reference materials agree well with the certified values.

scholarly journals Bioaccumulation of Some Heavy Metals in Ayre Fish (Sperata Aor Hamilton, 1822), Sediment and Water of Dhaleshwari River in Dry Season

2012 ◽  
Vol 40 (1) ◽  
pp. 147-153 ◽  
Author(s):  
Abu Tweb Abu Ahmed ◽  
Suman Mandal ◽  
Didarul Alam Chowdhury ◽  
Abu Rayhan M Tareq ◽  
M Mizanur Rahman
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Atomic Absorption ◽  
Water Samples ◽  
Dry Weight ◽  
Acid Digestion ◽  
Fish Organs ◽  
Flame Atomic Absorption ◽  
Flame Atomic Absorption Spectrophotometer ◽  
Nitric Acid Digestion

The present study was carried out to determine the level of bioaccumulation of some heavy metals in a freshwater fish Ayre (Sperata aor Hamilton, 1822) collected from Rajfulbaria (23°48?56.36? N and 90°14?54.04? E) of  Dhaleshwari river. Four heavy metals, namely chromium (Cr), copper (Cu), lead (Pb), and cadmium (Cd) were selected for this study. Metal concentrations were   determined by Flame Atomic Absorption Spectrophotometer after nitric acid  digestion of samples. The concentrations of accumulated heavy metals in fish were  also compared with the concentrations of metals in the sediments and waters of  that river. The level of bioaccumulations in different organs of S. aor were determined separately and compared among them. Average bioaccumulation levels  in S. aor were Cr: 1.458 mg/kg, Cu: 31.500 mg/kg, Pb: 18.776 mg/kg and Cd:  0.487 mg/kg of dry weight. The levels of heavy metals in sediments were Cr: 27.393 mg/kg, Cu: 37.450 mg/kg, Pb: 15.797 mg/kg and Cd: 2.083 mg/kg, and in water were Cr: 0.130 ppm, Cu: 0.000 ppm, Pb: 0.201 ppm and Cd: 0.001 ppm.The bioaccumulation of these four heavy metals in fish organs, sediment and  water samples were also compared with FAO approved standard levels and other  related studies, and found that the levels of bioaccumulation in the Dhaleshwari river exceeded all the standard levels. DOI: http://dx.doi.org/10.3329/bjz.v40i1.12904 Bangladesh J. Zool. 40(1):147-153, 2012

Effect of nitric acid digestion on organic materials and silica in rice husk

1997 ◽  
Vol 7 (8) ◽  
pp. 1505-1509 ◽  
Author(s):  
I. A. Rahman ◽  
J. Ismail ◽  
H. Osman
Keyword(s):  
Nitric Acid ◽  
Rice Husk ◽  
Organic Materials ◽  
Acid Digestion ◽  
Nitric Acid Digestion
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