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News From The Bench
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What I think: | An ideal chemist is one with lots of experience and lots of chemistry education who works in a lab. What I heard: There is no mathematical equation that can solve a real world chemistry problem. And therefore real world chemistry solutions are approximations. A perfectionist is capable of closing down any institution in the world, but then so is a sloppy person. Only it would take a sloppy person longer to do it. Why? A logical argument is: Common sense is learned. Therefore there is no common sense. References or literature information that might pertain to some of the information found here can also be found in 'The Library' section of this internet site. And now something practical from the chemistry laboratory bench. GC information: Given the same capillary column length, a thicker stationary face will provide better resolution than a smaller ID column. In other words, a better separaton will be obtained on the 0.53 um ID and 1 ul stationary face than on 0.32 um ID and 0.5 or 0.25 ul stationary face. Bellow additional practical laboratory bench topics are covered.
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Sample Prep For IR Work:
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For the ones who have never done quantitation using IR, it is a messy work. Bench work is messy work anyway, but quantitating with IR using liquid cell seems to exponentially increase the messiness. Because of the small orifice in the liquid cell, it becomes an art to fill the cell with liquid. Practice will definitely help in avoiding the pitfalls but will not eliminate the messiness. | The best samples to quantitate with IR are the nitriles and silicone oils. Nitriles because they have a very unique absorbance around 2250 cm-1 and silicone oils, because they absorb very strongly in the 1100 cm-1 region. Remember always review literature before starting any quantitation work with IR or as a matter of fact any other analytical instrument.
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Glassware Cleaning:
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Laboratory glassware cleaning tip for those individuals working in the lubricant industry: | (Please note all chemicals must be handled under GLP conditions.) Once a lubricant coats the surface of a beaker or any other glass container it becomes very difficult to remove it. Soaps and detergents do an efficient job in removing lubricants some of the time, but for those other times, or just to be sure times (remember carry over and contaminations can be night mirrors), use 15 % Nitric Acid (this is a very corrosive chemical and must be handled with extreme care) in water. To 850 ml water add 150 ml concentrated Nitric Acid, and you have a Nitric Acid cleaning solution. You can either immerse the glassware into the solution or just rinse it. Repeat this two times and in between rinse with water. Remember that the final rinse always needs to be pure water (final rinse three to five times with water). Note, it is my understanding that the Nitric Acid cleaning solution can also be used to remove thin films of polymers deposited on glass surfaces, emulsifying agents, and most other long chain molecules belonging to the oil (including from fat) and phthalate families. Good luck! GO HOME:
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