Repeatable separation of microplastics integrating mineral oil extraction and a PDMS-Ni foam adsorbent in real soil

2022 ◽  
Vol 429 ◽  
pp. 132517
Jungmin Kim ◽  
You-Jin Lee ◽  
June-Woo Park ◽  
Sung Mi Jung
Stefano Caimi ◽  
Claudio Colombo ◽  
Raffaele Ferrari ◽  
Giuseppe Storti ◽  
Massimo Morbidelli

To remove the mineral oil impregnating the insulating paper present in old, disconnected, underground electrical cables, which represents a threat to the environment, two approaches are investigated at laboratory (1 m) and pilot (10 m) scales. The first one involves in situ polymerization to clog the inner channel of the cables and to enable the washing of the outer paper region impregnated by the oil by axial flow of a displacing fluid (water). The second approach leaves the inner channel open and employs repeated cycles of pressurization and rest to displace the oil contained in the paper by radially pushing the water from the inner channel into the outer layers. The pressurization and rest times were optimized to obtain the highest oil extraction rate. While the first approach showed limitations in terms of required pressures and operating time, which increase with the length of the cables, the second one was effective at removing 97% of the oil impregnating the paper layers within 25 cycles. Even more relevant, this second solution, in contrast to the first one, can be easily scaled up as it does not depend on the length of the cable, and was successfully tested on a 10 m cable, showing 98% oil recovery.

1972 ◽  
Vol 55 (1) ◽  
pp. 69-70
Russell G Dent

Abstract Collaborative results are presented for a method proposed for light filth extraction from canned fish packed in water, oil, or vegetable sauces. The method utilizes an acid digestion and a hot mineral oil extraction from an aqueous phase in a Corning percolator. Recoveries are reproducible and filter papers are relatively clean. This method is recommended for adoption as official first action to replace procedure 40.064.

Titilope John Jayeoye ◽  
Mary Bosede Ogundiran ◽  
David Abimbola Fadare ◽  
Adeniyi Adewale Ogunjobi

This paper reports evaluation of physicochemical and biodegradability properties of selected non edible Nigerian oilseeds as a potential cutting fluid. Oil extraction process was carried on the oilseeds, with physicochemical parameters and biodegradability of the extracts were equally assessed. The established physicochemical parameters were percentage oil yield (5.58-61.8%), specific gravity (0.86-0.94), acidvalue (2.89-18.2 mgKOH/g), iodine value (15.7-104 mg iodine/g), peroxide value (1.35-10.9 mg/g oil), saponification value (173-286 mg KOH/g) and viscosity (37.9-53.1centipoises), while biodegradabilityranged between (50.0-63.8%) in comparison with the mineral oil with values less than 20%. Based on this study, the oil extracts of Caesalpinia bonduc and Calophyllum inophyllum appeared to be the most suitable as potential cutting fluids for further formulation studies and machining trials. 

1970 ◽  
Vol 53 (3) ◽  
pp. 562-566
Joel J Thrasher

Abstract Collaborative results are presented on a new method for the extraction of light filth from bread and donuts. The new method consists of product dispersion by steam bath heating or autoclaving, wet sieving on No. 230 sieve, digestion with HC1, followed by extraction of filth with mineral oil from water. Minimum recovery of spike filth elements was 82%. The new method also proved to be faster than method 36.025 and resulted in cleaner filter papers than 36.026. The proposed method is recommended for adoption as official first action.

1969 ◽  
Vol 52 (3) ◽  
pp. 463-465
Joel J Thrasher

Abstract A method for the extraction of light filth from alimentary pastes based on rapid autoclaving of acidified samples, wet sieving on a No. 230 plain weave sieve, and heating the sieve retainings in an acidic mineral oil mixture is described. This new method is faster and results in higher and more reproducible recoveries than method 36.025. Recoveries were equal or better than those achieved by the official method, and the filter papers were cleaner.

1985 ◽  
Vol 68 (5) ◽  
pp. 899-901
Russell G Dent ◽  
Larry Glaze

Abstract Ihe present method for filth in unground marjoram is conducted in 2 parts. The first of these, which is for heavy filth and sand, requires the spice to be boiled with petroleum ether, then floated off with chloroform and, if needed, carbon tetrachloride. The second part, which is for light filth, is dependent on completion of the heavy filth section. After the spice is air-dried, the light filth is extracted with heptane and water. The proposed method was developed to make light filth independent of heavy filth analysis, improve filth recoveries, and reduce microscopic examination time. The light filth is extracted by ethanol defatting followed by a combination 15-60% ethanol/mineral oil extraction in a Wildman trap flask. Tween 80-NaEDTA solution is added to the trapping system to reduce the rising of excess plant material to the trap interface. The official method (AOAC 13th edition sees 44.142,44.120(b)) produced an average of 8 extraction papers per test portion and microscopic examination took an average of 88 min per test portion. The official method gave average recoveries of 14% for rodent hairs and 26% for insect fragments with 2 spike levels of 15 and 30 for each filth element. Recoveries of the 2 levels of each spike were not significantly different (P > 0.05). The proposed method gave average recoveries of 73% for rodent hairs and 70% for insect fragments. The proposed method has been adopted official first action to replace AOAC 13th edition sees 44.142 and 44.120(b) for unground marjoram only

1979 ◽  
Vol 62 (3) ◽  
pp. 597-599
Emma J Colliflower ◽  
Joel J Thrasher

Abstract The official methods for extracting light filth from rubbed sage, 44.D08–44.D10, specifies a hot isopropanol pretreatment and flotation from cooled dilute isopropanol with mineral oil to extract light filth. The method gives good recoveries, but occasionally excessive interfering plant material is extracted along with the filth elements. A new method has been developed in which chloroform is used for pretreatment instead of isopropanol, and Tween 80-EDTA is added twice rather than once. This method has given consistently cleaner filter papers and better recoveries for rodent hairs, 85 vs. 79%, and for elytral squares, 95 vs. 84%. The new method has been adopted as official first action.

1978 ◽  
Vol 61 (4) ◽  
pp. 906-907
Naoma Doris Holtgreve

Abstract An improved method has been developed for extracting light filth in rubbed sage. The method is similar to 44.A04 and 44.A05, except the light filth is isolated by using 20% isopropanol with mineral oil. Collaborative results show that the proposed method yielded better recoveries than the present official first action method. The method has been adopted as official first action.

1952 ◽  
Vol 20 (4) ◽  
pp. 587-594 ◽  
Frederick Steigmann ◽  
Hans Popper ◽  
Hattie Dyniewicz ◽  
Irene Maxwell

2012 ◽  
Vol 46 (3) ◽  
pp. 29

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