Action of dilute nitric acid on isolated lignin

1956 ◽  
Vol 5 (2) ◽  
pp. 239-241
Author(s):  
A. A. Chuksanova ◽  
L. L. Sergeeva ◽  
N. N. Shorygina
Keyword(s):  
Nitric Acid ◽  
Dilute Nitric Acid

scholarly journals Microbial nitrification and acidification of lacustrine sediments deduced from the nature of a sedimentary kaolin deposit in central Japan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tetsuichi Takagi ◽  
Ki-Cheol Shin ◽  
Mayumi Jige ◽  
Mihoko Hoshino ◽  
Katsuhiro Tsukimura
Keyword(s):  
Nitric Acid ◽  
Lacustrine Sediments ◽  
Kaolin Clay ◽  
Central Japan ◽  
Inland Lakes ◽  
Fe Oxidation ◽  
Stable Isotopic ◽  
Fe Hydroxide ◽  
Kaolin Deposit ◽  
Dilute Nitric Acid

AbstractKaolin deposits in the Seto-Tono district, central Japan, were formed by intense kaolinization of lacustrine arkose sediments deposited in small and shallow inland lakes in the late Miocene. Based on mineralogical and stable isotopic (Fe, C, N) studies of Motoyama kaolin deposit in the Seto area, we concluded that it was formed by microbial nitrification and acidification of lacustrine sediments underneath an inland lake. Small amounts of Fe–Ti oxides and Fe-hydroxide in the kaolin clay indicated that iron was oxidized and leached during the kaolinization. The field occurrences indicate that leached ferric iron precipitated on the bottom of the kaolin deposit as limonite crusts, and their significantly fractionated Fe isotope compositions suggest the involvement of microbial activity. The C/N ratios of most of the kaolin clay are distinctly higher than those of modern lacustrine sediment. Although, the possibility of a low-temperature hydrothermal origin of the kaolin deposit cannot be completely ruled out, it is more likely that acidification by dilute nitric acid formed from plant-derived ammonia could have caused the kaolinization, Fe oxidation and leaching. The nitrate-dependent microbial Fe oxidation is consistent with dilute nitric acid being the predominant oxidant.

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.

scholarly journals Ultrasonic extraction of several cations with dilute nitric acid solutions from soils.

1982 ◽  
Vol 31 (11) ◽  
pp. E409-E412 ◽  
Author(s):  
Yuzo TAMARI ◽  
Yukiharu INOUE ◽  
Haruo TSUJI ◽  
Yuzuru KUSAKA
Keyword(s):  
Nitric Acid ◽  
Ultrasonic Extraction ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Dilute Nitric Acid

scholarly journals Great Enhancement in the Oxidation Ability of Dilute Nitric Acid in Nanoscale Water-Droplets of Reverse Micelle Systems

2006 ◽  
Vol 79 (8) ◽  
pp. 1215-1222 ◽  
Author(s):  
Masashi Hojo ◽  
Tadaharu Ueda ◽  
Chihiro Daike ◽  
Fumiko Takezaki ◽  
Yumi Furuya ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Reverse Micelle ◽  
Water Droplets ◽  
Dilute Nitric Acid

Neutron activation analysis of waster sherds from Tocra

1974 ◽  
Vol 6 ◽  
pp. 30-31
Author(s):  
G. W. A. Newton ◽  
W. Krywonos
Keyword(s):  
Nitric Acid ◽  
Neutron Activation ◽  
Element Distribution ◽  
Trace Element Distribution ◽  
Distilled Water ◽  
Surface Material ◽  
Foreign Matter ◽  
Kiln Site ◽  
Pottery Kiln ◽  
Dilute Nitric Acid

The purpose of the present study was to measure the trace element distribution of waster pieces of coarse ware found on the pottery kiln site associated with Roman Tocra. These would then be compared with other coarse ware sherds found in Cyrenaica.Neutron activation has been chosen as the method of analysis because several elements can be determined simultaneously, and also many samples can be analysed routinely.Samples from any sherd were obtained as follows:The sherd was brushed lightly to remove any foreign matter. It was then sliced with a diamond-coated saw into pieces about 5 mm × 5 mm × 2 mm all surface material being removed in the process. Each piece was washed quickly in dilute nitric acid (ANALAR), rinsed in distilled water and finally boiled for 2 minutes in distilled water. The samples were dried in an oven at 120° C. During all procedures polythene gloved hands and clean tweezers were used for manipulation.Each sample was wrapped individually in aluminium foil and labelled with a heat resistant indelible marker. All the samples were placed in an aluminium can together with suitable standards for irradiation.In this investigation the elements determined were scandium and iron. The oxides of these elements are commercially available in a very pure form (SPECPURE).A known weight of the oxide was dissolved in hot concentrated ANALAR acid, hydrochloric acid for iron and nitric acid for scandium, and diluted to 25 ml in a graduated flask. The resulting solutions were about 1.5 mg per ml for iron and 0.15 mg per ml for scandium.

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