photos show where the droplets hit minutes after it happened. She thereafter visited theStudent Health Center for medical treatment.One week later.
Two weeks later So as not to leave anything to chance, we can'temphasize too strongly that strong acids are to betreated with respect and care. The image on theright shows the result of a splash and extendedcontact of 3M sulfuric acid six months after itoccurred. The student was working in a non-university laboratory. His supervisor spilled andsplashed some 3M sulfuric acid but was not awarethat any had gone beyond the immediate work bench area. The student was standing a few feetaway. An hour after the splash occurred thestudent felt a burning sensation near his ankle. He was wearing elastic sweat pants withdirect contact with his skin in that area. When he tried to pull up his pant leg to find outwhat was causing the burning sensation he noticed that the fabric had bonded (more or less) to his skin at the place producing the burning sensation. He realized what hadhappened and soon thereafter cut away the bottom of his pant leg and sought medicaltreatment. The remaining scar is a good indication of the long-lasting appearance of suchan injury.
Any acid which contacts the skin must be washed off immediately. Acid which dribblesdown the outside of laboratory stock bottles offers a familiar peril to students who use bottles of reagents in common.One is not immediately conscious of such contact because even in the case of concentrated acidsthere is some delay before the reaction betweenacid and skin raises the temperature sufficientlyfor one to feel the effect. Students are advised to be conscious at all times of potential mishapscaused by their procedures and to be prepared totake immediate and appropriate action. If fingersor other areas having exposed skin feel wet whenthey ought not to be wet, the surface should bewashed immediately in running water. The imagesat the left and right show the effect of either concentrated sulfuric or nitric acids whichstayed on the skin for more than a few seconds (but less than a minute) before beingwashed off. Fortunately most discolorations caused by such contact disappear within afew days, but constant vigilance in the laboratory is the rule which should be followed atall times.Continuing with the presentation of helpful hints, the presence of the concentratedsulfuric acid aids in the exclusion of the remaining nitrogen oxides from the hot solution.Those red oxides first boil off, then one sees fumes of sulfur trioxide beginning to escape,as at the left
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