Sample Prep - Chromatography Forum

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Welcome! by tom jupille » Sat Nov 13, 2010 9:02 pm	0	7853	Last post by tom jupille Sat Nov 13, 2010 9:02 pm

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Please Read This! by tom jupille » Sat Nov 13, 2010 11:54 pm	0	8453	Last post by tom jupille Sat Nov 13, 2010 11:54 pm
How to embed chromatograms and reports by tom jupille » Sat Nov 13, 2010 11:53 pm	0	8253	Last post by tom jupille Sat Nov 13, 2010 11:53 pm
Where to look first. by tom jupille » Sat Nov 13, 2010 11:52 pm	0	8335	Last post by tom jupille Sat Nov 13, 2010 11:52 pm
SPE Class A requirement? Graduated conical centrifuge tubes by LALman » Tue Mar 31, 2020 9:22 pm	1	110	Last post by James_Ball Tue Mar 31, 2020 9:49 pm
PAH / DRO by hexane/acetone microwave/ultrasonic extraction by LALman » Wed Sep 05, 2018 8:41 pm	9	3774	Last post by LALman Wed Mar 11, 2020 5:55 pm
525.2 Extraction Guidance by ScientiaPotentiaEst » Fri Feb 21, 2020 2:46 pm	4	523	Last post by James_Ball Mon Mar 02, 2020 10:45 pm
Matrix-matched calibration question by thohry » Thu Feb 20, 2020 1:32 pm	1	416	Last post by Steve Reimer Thu Feb 20, 2020 5:00 pm
Auto pipette availability by Bigbear » Wed Feb 19, 2020 3:10 pm	0	455	Last post by Bigbear Wed Feb 19, 2020 3:10 pm
Pesticides analysis by johnmario » Sat Feb 08, 2020 2:00 pm	1	598	Last post by rb6banjo Tue Feb 11, 2020 5:16 pm
EPA 549.2 Conditioning Solution A by MadAsAHatter » Tue Feb 04, 2020 5:33 pm	2	511	Last post by Mritari Thu Feb 06, 2020 8:16 pm
Oxidation using Oasis WCX cartridges by Mattias » Fri Jan 24, 2020 1:06 pm	0	802	Last post by Mattias Fri Jan 24, 2020 1:06 pm
Diazald availibility by Bigbear » Thu Jan 09, 2020 12:59 pm	4	776	Last post by James_Ball Thu Jan 09, 2020 10:54 pm
about weighing out material by agao123 » Tue Dec 17, 2019 4:43 am	4	953	Last post by rb6banjo Fri Jan 03, 2020 2:05 pm
Explanation of derivitization sequence by john@sombra » Fri Dec 20, 2019 9:44 pm	0	949	Last post by john@sombra Fri Dec 20, 2019 9:44 pm
Preparation of octenyl succinate by mkarkov » Fri Dec 20, 2019 12:34 pm	0	807	Last post by mkarkov Fri Dec 20, 2019 12:34 pm
Purge and trap - loss of methylene chloride by Mathieu_CZRI » Mon Aug 28, 2017 6:01 pm	18	5106	Last post by Bigbear Wed Dec 18, 2019 1:34 pm
sample in pH=7.4 buffer with salts by agao123 » Mon Sep 16, 2019 3:43 pm	2	1721	Last post by agao123 Wed Nov 27, 2019 5:00 pm
peroxide transfer from textiles to water by ucanmoruk » Wed Nov 13, 2019 11:45 am	1	938	Last post by Steve Reimer Mon Nov 18, 2019 9:37 pm
Sodiumazide in alkaline hydrolysis by Förbrylium » Tue Nov 12, 2019 9:21 am	0	1039	Last post by Förbrylium Tue Nov 12, 2019 9:21 am
Automatic timer 40 amps for hot plates by bdhedhy19 » Mon Oct 21, 2019 3:04 am	3	1474	Last post by bdhedhy19 Tue Nov 05, 2019 3:37 am
Poor Recoverability From SPE by handlovic » Thu Oct 10, 2019 1:48 am	2	1565	Last post by Steve Reimer Mon Oct 28, 2019 5:00 pm
Derivatization with MSTFA, NH4I and Ethanethiol by chem0211 » Tue Oct 15, 2019 7:54 am	2	1415	Last post by trozen Fri Oct 25, 2019 3:38 am
Povidone Nitrogen Content - Kjeldhal method by Geof235 » Fri Oct 18, 2019 4:45 pm	3	1289	Last post by DR Wed Oct 23, 2019 1:57 pm
Derivitization Reaction for sample analysis by Geof235 » Fri Oct 18, 2019 8:49 pm	0	1522	Last post by Geof235 Fri Oct 18, 2019 8:49 pm
SPME procedure modification by Pynball » Mon Sep 30, 2019 10:41 am	5	1468	Last post by Dorlis03 Tue Oct 08, 2019 5:54 am
Background peaks and trash in extraction by ScientiaPotentiaEst » Wed Sep 25, 2019 6:25 pm	3	1399	Last post by ScientiaPotentiaEst Thu Sep 26, 2019 12:29 pm
Does lactose monohydrate convert to lactose after drying? by chemist23 » Thu Sep 19, 2019 1:15 pm	1	1486	Last post by DR Thu Sep 19, 2019 7:27 pm
SPE stationary phase by Pynball » Thu Sep 12, 2019 9:42 am	1	1472	Last post by tom jupille Fri Sep 13, 2019 11:48 pm
SIDA issue by Krusvar » Mon Sep 02, 2019 12:50 pm	6	1811	Last post by James_Ball Wed Sep 11, 2019 4:54 pm
Enzyme activity by direct monitoring of transamination rxn by JLeeHads » Thu Aug 29, 2019 2:57 pm	0	1768	Last post by JLeeHads Thu Aug 29, 2019 2:57 pm
Australian supplier of acetyl chloride? by brewerbill » Mon Jun 24, 2013 2:04 am	2	2968	Last post by xqwert Wed Aug 21, 2019 11:38 am
Calibration of balances, weights, and required check range by LALman » Fri May 04, 2018 8:11 pm	8	5347	Last post by LALman Mon Aug 19, 2019 12:22 am
Dilution Factor For Method 9056 by adamwmcanally » Thu Aug 08, 2019 3:10 pm	1	1510	Last post by James_Ball Thu Aug 08, 2019 6:36 pm
How to determine 5ppm impurity in 1 gram API? by Simyo » Tue Aug 06, 2019 7:55 am	4	1642	Last post by Simyo Wed Aug 07, 2019 7:35 am
Dilution from stock solution - wrong results by Ma Yik Ken » Fri Aug 02, 2019 2:15 pm	1	1629	Last post by James_Ball Fri Aug 02, 2019 2:38 pm
Dilution factor by Suraz » Fri Jul 19, 2019 3:33 pm	2	2618	Last post by Suraz Mon Jul 29, 2019 2:16 pm
Alternative SPE solvent? by Cantacoxinha » Thu Jul 25, 2019 2:08 pm	2	2263	Last post by Cantacoxinha Fri Jul 26, 2019 7:29 am
Humic Acid cleanup in 8270/625 extracts by James_Ball » Tue Jul 23, 2019 7:20 pm	3	2123	Last post by LALman Fri Jul 26, 2019 12:34 am
Pierce C18 tips vs. home made StageTips/microcolumns by gvudrun » Mon Jul 01, 2019 12:17 pm	0	2506	Last post by gvudrun Mon Jul 01, 2019 12:17 pm
New Purge & Trap for EPA 524.3- Advice on manufacturer? by ciemnla » Sun Jun 02, 2019 7:24 pm	2	2348	Last post by ciemnla Sun Jun 09, 2019 1:12 pm
Sample prep for acetaminophen in water by LCMSMS using SPE by hts123 » Tue May 14, 2019 9:54 am	4	2453	Last post by Aldijkhuizen Tue May 21, 2019 6:43 pm
Sample intake for premixtures by Rndirk » Wed May 08, 2019 7:23 am	4	2331	Last post by James_Ball Thu May 09, 2019 7:34 pm
Pesticides in Oil by debora.ferreira » Thu Apr 11, 2019 11:52 am	15	3250	Last post by HPLC chemist Sun May 05, 2019 12:00 am
Sample containing HPMC 4M by Geof235 » Sun Apr 28, 2019 7:44 pm	4	2332	Last post by Zoraku Mon Apr 29, 2019 9:19 pm
Repipet calibration? by Bigbear » Tue Jun 03, 2014 12:34 pm	13	7254	Last post by LALman Thu Apr 11, 2019 6:18 pm
EPA 548.1 Extraction Issues by thewrightben » Fri Apr 05, 2019 4:36 pm	0	2384	Last post by thewrightben Fri Apr 05, 2019 4:36 pm
Surfactant Removal by Zoraku » Tue Jan 29, 2019 11:41 pm	10	3721	Last post by Zoraku Tue Apr 02, 2019 9:11 pm
EPA1694- Testing Panadol in water LCMSMS by hts123 » Wed Mar 20, 2019 2:32 pm	2	2438	Last post by James_Ball Mon Mar 25, 2019 6:56 pm
Methanol and Ethanol by headspace by sohaib1 » Fri Sep 21, 2018 3:15 pm	2	3312	Last post by Bigbear Mon Mar 25, 2019 12:56 pm
Autotrace 280 by Bigbear » Mon Mar 18, 2019 6:02 pm	0	2318	Last post by Bigbear Mon Mar 18, 2019 6:02 pm

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