Laserfiche WebLink
Brown, Sand <br />From: Stark, Jim <br />Sent: Thursday, February 24, 2005 1:53 PM <br />To: Brown, Sandy; Dudash, Joe <br />Subject: h <br />`-~'-~i Bea.- ,a ,~u- sli M p1°s <br />I was cleaning the trunk of my car out at lunch and I noticed that I still had the three sample bottles that I was going to take <br />to the WQCD lab for the quick humic acid check. I was only about 10 minutes from the lab so I thought "I am just going to <br />run by and see..." I talked to the friend of mine who still works there and he let me use the main lab (I do not know why I <br />did not consider this in the first place, but, oh well). I was able to do several different quick tests that I think may help. <br />First, I performed the simple aqueous extraction (using NaOH and HCI). This produced the black precipitate that is <br />indicative of humic acids. There was not a lot (not enough to put back into solution for further analyses) but I filtered it and <br />it was definitely there. It then redisolved with a dilute solution of NaOH, which humic acids are supposed to do. I also ran <br />several scanning spectra to see if there was a peak at -520nm as stated in one article I had read. There was no single <br />peak but, as the scanning approached the UV range, the absorbance continually increased (I scanned from 700-250nm). <br />This is indicative of the presence of organics, they absorb UV light (so that was somewhat encouraging). I will put all of <br />this in a memo to you so it can be a bit more formal. <br />I was also able to find out the status of the other samples. The TOC samples (total organic carbon) are still sitting there as <br />there is a computer problem. They expect a replacement board "any day". The metals analyses are being held to be <br />batched with other "nasty" samples (since they crap up the quadrapoles and require them to be cleaned). I stated that we <br />REALLY need the data ASAP and he said he could dilute them and run them early next week. He will then a-mail me the <br />results so we should have them at some point next week. I also left a message at CSU. They are usually not at their <br />desks, as they are in the lab, but they return their calls within a day. If the CSU samples come back "negative", I have a <br />couple of other ideas that may help in the determination... <br />James R. Stark <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />(303)866-4929 <br />