Laboratory glassware cleaning

Many commercially available detergents are suitable for this purpose, and some manufacturers market special formulations for cleaning laboratory glassware some of these, e.g. Decon 90 made by Decon Laboratories of Portslade, are claimed to be specially effective in removing contamination due to radioactive materials. 

Cleaning Laboratory glassware jewellery computer components large, delicate... 

Chromium(VI) oxide is used for chromium plating copper stripping as an oxidizing agent for conversion of secondary alcohols into ketones (Jones oxidation) as a corrosion inhibitor in purification of oil and in chromic mixtures for cleaning laboratory glassware. 

Nitric acid was being used to clean laboratory glassware to a very high state of surface cleanliness by soaking in a bucket of cone, acid for a week. During this time, one of the empty winchesters was inadvertently used as a solvent residues bottle and some 250 ml of diethyl ether was put in. The acid was to be recovered for re-use and it was put back into the original bottles. When the bottle containing ether was refilled and screw capped, after a few seconds it exploded violently [5]. 

Acetone is commonly used to clean laboratory glassware when soap and water cannot do the job. Acetone works well because it dissolves certain substances that are not soluble in water. It is also a good choice because, being miscible with water, it can easily be rinsed from the cleaned glassware with water. Explain what it means when we say acetone is miscible with water. 

Drying of Cleaned Laboratory Glasswares. There are, the fact, two different sizes of glass apparatus one invariably comes across in a chemical laboratory, for instance (a) small and ib) large and bulky. 

Normal laboratory glassware must first be washed and cleaned. It has to be rinsed with deionised water. The clean glassware is sterilised in an oven set at 200 °C for 1 1 hours. It is suitable to cover glassware with aluminum foil to maintain aseptic conditions after removing the glassware from the oven. If aluminum foil is not available, special heat-resistant wrap paper can be used. The sterile glassware must be protected from the air, which has micro-flora, or any contaminants. Avoid the use of any plastic caps and papers. Detach any labelling tape or other flammable materials, as they are fire hazards. 

Laboratory glassware containing diethyl ether residues was cleaned with a sulpho-nitric mixture and caused detonation of the container. 

The electrolyte volume of the STM cells is usually very small (ofthe order of a 100 pi in the above-described case) and evaporation of the solution can create problems in long-term experiments. Miniature reference electrodes, mostly saturated calomel electrodes (SCE), have been described in the literature [25], although they are hardly used anymore in our laboratory for practical reasons Cleaning the glassware in caroic acid becomes cumbersome. For most studies, a simple Pt wire, immersed directly into solution, is a convenient, low-noise quasireference electrode. The Pt wire is readily cleaned by holding it into a Bunsen flame, and it provides a fairly constant reference potential of fcj>i — + 0.55 0.05 V versus SCE for 0.1 M sulfuric or perchloric acid solutions (+ 0.67 0.05 V for 0.1 M nitric acid), which has to be checked from time to time and for different solutions. 

Environmental water samples to be analyzed for phosphate are not stored in plastic bottles unless kept frozen, because phosphates can be absorbed onto the walls of plastic bottles. Mercuric chloride, used as a preservative and acid (such as the nitric acid suggested for metals above), should not be used unless total phosphorus is determined. All containers used for water samples to be used for phosphate analysis should be acid rinsed, and commercial detergents containing phosphates should not be used to clean sample containers or laboratory glassware. 

Glass Cleaning and Solvents Used. A brief description is given in Vol 3 of Encycl, p C329-L under "Cleaning Solutions for Laboratory Glassware". A rather complete description is given... 

All toxic materials were disposed of in accordance with Prudent Practices in the Laboratory" National Academy Press Washington, DC, 1995. Clorox solutions were used for cleaning reaction glassware. 

Resin Elution Concentration. The first three ethyl ether elutions were combined into a 500-mL glass bottle with a Teflon cap liner. The bottles and all the laboratory glassware used in the sample analysis were cleaned with 6.0 N HC1, acetone, and hexane and then baked at 200 °C to remove the solvent. The combined elutions were brought to the laboratory for evaporative concentration and analysis. 

Cleaning of Laboratory Glassware and Cleaning Mixtures. See Lange (1961), 1776... 

The glass plates should be cleaned with a laboratory glassware cleaner such as RBS-35 (Pierce), rinsed well, and dried. 

A clean laboratory and equipment are undoubtedly crucial to all analytical methods. For trace element and POP measurements, however, additional precautions need to be taken. Glassware and other materials used for storing samples may act as both a source and a sink for some transition and heavy metal ions. Consequently, it is important to clean glassware and polyethylene equipment several times with dilute solutions of nitric acid followed by deionized water. Gloves must be worn whenever working with samples and sampling equipment. 

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