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Author Topic: Anybody Good at Chemistry? David Buckley Jedi Master Film Handler Posts: 525 From: Oxford, N. Canterbury, New Zealand Registered: Aug 2004 posted 01-06-2019 08:36 PM                        quote: Randy Stankey I did have a close call with some pure (96% reagent grade) sulfuric acid That's brought back a surpressed memory, we used to pipette something similar to that, and I got a mouthful of it one day. Makes your teeth fizz. Most unpleasant...  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 01-06-2019 09:29 PM                     Dude! Use a pipette bulb! I regularly work with cyanide. (Potassium cyanide, sodium cyanide, copper cyanide and a few exotic ones like gold cyanide.) I would never even consider pipetting by mouth! Right, at this very moment, there is a skid that has twelve 25 kg. drums of KCN. Just to give you a sense of gravity, that's enough to kill 1.5 million average size men or to put 3 million men, gravely ill, in hospital. Point I'm making is that we don't fuck around with chemicals where I work. What the hell could you have accidentally pipetted into your mouth? If it was reagent grade sulfuric acid, you probably would be able to speak for the rest of your life, at least not without a speech impediment. That assumes that you lived through it. Sulfuric acid reacts exothermically (and sometimes violently) with water. One of the jobs I have to do is to add it to one of the plating baths. If you add a gallon of H2SO4 to a 100 gallon tank of water you will raise the temperature a couple-three degrees in less than a minute. If you got concentrated sulfuric in your mouth it would instantly boil the water in your saliva and cause severe burns and blisters. It wouldn't just make your teeth fizz. Your teeth would be corroded down to nubs in a very short time. When I got burned by H2SO4, I was pumping it out of a 55 gal. drum with a siphon pump. The hose slipped and fell on the ground. In the process, some of the residual acid in the hose flung out and splashed me. When the hose hit the ground, acid splashed upward. Even though I was wearing a chemical apron, gloves up to my elbows, boots up to my knees, eye goggles and a face mask, the stuff came up under the mask and hit me in the left side of the neck. I felt the stuff hit and I thought, "Oh, shit! This is going to hurt!" No sooner did I complete the thought the acid started to burn and I headed for the emergency wash station. That stuff was on my skin for less than 30 seconds and I still got blisters and scabs. It took almost a month to completely heal but I still have scars. Now, when guys get to drinking and boasting about their injuries and scars, I've got the sure winner. Right? (C'Mon! We've got to laugh about things like this or we wouldn't survive life. Right? ) If you would have gotten acid in your mouth, you wouldn't be laughing, right now... because you probably wouldn't be able to laugh.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-09-2019 11:49 AM                        There should be no shortage of "consulting engineers" who are Chemical Engineers. This is why those guys have to take State licensening exams. Hire the consult on a one-time basis. Legally, it is the right thing to do for your company, paper work in order, signed off by a pro who does this kind of work. Your insurance company, if they knew, would demand it. Be careful at work; a circuit board company I know eventually had to close due employee chemical damage.  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 02-22-2019 08:38 PM                     Just an update... I have been using the test for over a month, now, and it's working out well. I made a fresh tank of chemicals on January 8th, performed regular tests at least once per week and made additions of peroxide as the tests indicated. The bath lasted until today when I finally had to change it out and make a new batch. That's over six weeks on the same batch when, before, we were making a new batch almost every week. Since a fresh batch of solution uses 90 lb. of Ammonium Bifluoride (Cost: $250/50 lb. bag) we've saved over $2,500 in chemicals, alone. Furthermore, it takes a whole 50 lb. bag of lime to neutralize a like amount of ABF. Don't forget the time and trouble of disposing all that waste. I think this whole experiment turned out pretty well.  |  IP: Logged

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