Forming the sodium bisulfite adduct of Benzaldehyde.References Relevant Sciencemadness threads Sodium metabisulfite can be neutralized with bleach and then poured down the drain. Best way to store it is in plastic resealable bags. Sodium metabisulfite should be kept out of hot or humid environments and away from water and acids while indoors. Sulfur dioxide is very irritating and unpleasant as well as toxic. Sodium metabisulfite may cause allergic reactions to people who are sensitive to sulfites. Generate sulfur dioxide for use as a reducing agent.Sodium metabisulfite can be prepared by evaporating a solution of sodium bisulfite saturated with sulfur dioxide: Other stump removers may be potassium nitrate or other chemicals, so it is important to read the label/MSDS. Some stump removers, namely the one manufactured by Bonide (found at Home Depot), consist of sodium metabisulfite. The metabisulfite salt is usually stored in an air-tight bag inside the outer paper or plastic bag, to keep it dry and reduce the sulfur dioxide smell. Sodium metabisulfite is available as a wine preservative, either alone or mixed with potassium metabisulfite, product known as Campden tablets. Both of these reactions should be done outside or in a fume hood as sulfur dioxide is released, though to a much lesser extent in the case of Chevreul's salt. For many years precipitation by zinc dust, as by the Merrill-Crowe process, has been recognized as the most efficient and economical method of precipitating gold and silver from cyanide solutions. The little-known copper compound Chevreul's salt can be produced by boiling a mixture of copper(II) sulfate and sodium metabisulfite solutions. It can also be added to a solution of copper(II) chloride to precipitate copper(I) chloride. Perhaps the most famous example of this is the reduction of chloroauric acid to produce very pure elemental gold. Sodium metabisulfite itself can be used as a reducing agent as well as the sulfur dioxide it produces. Na 2S 2O 5 + 2 HCl → 2 NaCl + H 2O + 2 SO 2 The same thing happens when a strong acid is added. Read more about how to correctly acknowledge RSC content.When mixed with water or heated sodium metabisulfite releases sulfur dioxide, decomposing to sodium sulfite in the process. Permission is not required) please go to the Copyright If you want to reproduce the wholeĪrticle in a third-party commercial publication (excluding your thesis/dissertation for which If you are the author of this article, you do not need to request permission to reproduce figuresĪnd diagrams provided correct acknowledgement is given. Provided correct acknowledgement is given. If you are an author contributing to an RSC publication, you do not need to request permission Please go to the Copyright Clearance Center request page. To request permission to reproduce material from this article in a commercial publication, Provided that the correct acknowledgement is given and it is not used for commercial purposes.

This article in other publications, without requesting further permission from the RSC, Shi,Ĭreative Commons Attribution-NonCommercial 3.0 Unported Licence. Green synthesis and characterization of gold nanoparticles and their application for the rapid detection of glycyrrhizin with immunochromatographic stripsĭ. The rapid test strip is simple, fast, highly efficient and inexpensive, making it suitable for large-scale, rapid glycyrrhizin content determination. The test results are consistent with the data obtained by high-performance liquid chromatography (HPLC) with a coincidence rate of up to 100%. The cross-test showed that the strip has high specificity. Then, a colloidal gold immunochromatographic test strip based on the indirect competition method was developed for the rapid detection of GL, and the detection limit of this strip was 25 ng mL −1. To mitigate the high cost and low efficiency of current GL detection methods, we applied AuNPs to the immunochromatographic system. From this, we hypothesized that other compounds with sugar structures in Glycyrrhiza may also have the ability to reduce chloroauric acid. The D-glucuronic acid structure, rather than glycyrrhetinic acid (GA), plays an important reducing role in colloidal gold production. We also experimentally determined that in terms of chemical structure, GL can be used as a reducing agent to obtain colloidal gold. The formation of these GL-AuNPs was verified by the presence of a surface plasmon resonance band at 526 nm. The obtained NPs were approximately 35 nm in size. We successfully synthesized spherical gold nanoparticles (AuNPs) coated with glycyrrhizin (GL) by using GL as both a reductant and a stabilizer to reduce chloroauric acid. In this study, a facile and environmentally friendly synthesis process was proposed without regular chemical additives.

Precipitate gold from chloroauric acid