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Phase analysis of silver in ores refers to the determination of the content of silver in various host minerals. Through experimental analysis, it is established that the main silver phases in the ore include 6 types: silver in smithsonite, silver in minerals bearing iron and manganese, native silver, silver sulfide, silver in iron oxides, and silver in silicates. Acetic acid is used to leach silver from smithsonite, sodium chloride - hydroxylamine hydrochloride is used to leach silver from minerals bearing iron and manganese, ferric nitrate solution is used to leach native silver, thiourea - sulfuric acid solution is used to leach silver sulfide, hydrochloric acid - stannous chloride is used to leach silver from iron oxides, and the remaining residue is measured for silver in silicates. The relative standard deviation of this method for determining each silver phase ranges from 0.22% to 5.36%. The sum of the silver content from each phase closely matches the total silver content measured, indicating that the phase separation method is correct and the test results are accurate. [ABSTRACT FROM AUTHOR]

Ultrasonic assisted extraction method was used to extract polysaccharide from Zingiber officinale Roscoe. First, single factor and orthogonal test were used to optimize the extraction process of Zingiber officinale Roscoe polysaccharide. The experimental results showed that the optimal extraction process of Zingiber officinale Roscoe polysaccharide was as follows: liquid to material ratio 1 ∶ 20, homogenization time 5 min, homogenization temperature 70 ℃, ultrasonic time 80 min and ultrasonic temperature 80 ℃ . Under the condition of ultrasonic power of 100 W, the yield of polysaccharide was 12. 56%. Then, the antioxidant activity of the extracted Zingiber officinale Roscoe polysaccharide was determined. The experimental results showed that the hydroxyl radical scavenging ability of Zingiber officinale Roscoe polysaccharide reached 90. 96% at 5 mg / mL, and the reducing power was the strongest. [ABSTRACT FROM AUTHOR]

[Objectives]The paper aimed to investigate the effects of cold plasma treatment on the quality and antioxidant activity of fresh-cut carrots during storage, and to propose a basis for the application of cold plasma treatment in fresh-cut carrot preservation. [Methods]Fresh-cut carrots were treated with dielectric barrier discharge cold plasma at 60 kV for 5 min and stored at (10±1) ℃ for 72 h. Regular samples were taken to measure the quality parameters, polyphenols content and antioxidant activity of fresh-cut carrots. [Results]Cold plasma treatment could slow down the occurrence of white blush by inhibiting peroxidase activity and the accumulation of lignin and inhibit the growth of surface microorganisms in fresh-cut carrots. Cold plasma treatment maintained higher contents of ascorbic acid and total carotenoid in fresh-cut carrots. In addition, cold plasma treatment could improve the generation rate of ■ and H2O2 content during the early storage period, and improve the activities of phenylalanine ammonialyase (PAL),cinnamic acid 4-hydroxylase (C4H) and 4-coumaric acid coenzyme A ligase (4CL),and improve the contents of chlorogenic acid, caffeic acid and other phenolic substances and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging rate in fresh-cut carrots. [Conclusions]Cold plasma treatment could delay the quality deterioration of fresh-cut carrots, and improve the antioxidant activity by promoting the accumulation of phenolic substances. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Establishing a sound green, low-carbon, and circular development economic system and promoting the comprehensive transformation of economic and social development towards green and low-carbon are fundamental strategies for addressing China’s resource, environmental, and ecological issues. The gold industry actively responds to the national call for carbon reduction, incorporating the goals of peak carbon emissions and carbon neutrality into the overall development layout of enterprises. By building a framework for green and low-carbon technology standards, planning key standards for "dual carbon" and "green initiatives", and promoting the development of standardized personnel, the gold industry achieves green and low-carbon development, fully leveraging the leading, threshold, regulatory, and driving roles of standards, and guiding the industry towards high-quality development through green and low-carbon standards. [ABSTRACT FROM AUTHOR]

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Imaging Science & Photochemistry is the property of Imaging Science & Photochemistry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)