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Naphthalene Reporting with the new NEPM Fractions
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Hi, I am just wondering if ESdat knew about MGT reporting two results for Naphthalene, this is causing all the chemical tables to display a range of results based on the two diferent methods. MGT have said they are reporting the PAH based on the USEPA Method and then the other based on the new (Draft) NEPM TRH Screen. The two methods are done on two different machines, creating two different results, which requires manual altering due to the way ESdat produces the range in the table. thanks
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Rank: Guest
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Hi Alex, that link doesnt seem to work
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Groups: Registered, Administrators Posts: 498  Location: Byron Bay Was thanked: 19 time(s) in 19 post(s)
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Hi Kate, The link is fixed now - had an extra space on the end. Regards, Warwick
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Hi Warwick We're currently stuck on the same problem. I see the ranges go for naphthalene when you display grouping by method name or type but we really need to display our data group by Chem_Group. What i think we really need to do is edit the Chem_group for the organic method type to TPH/organic so it is grouped with that group, and the other result is grouped with the PAHs. I cannot edit this in the zref_Chemistry_lookup field as it only presents one option for naphthalene (i.e. Chem_group PAH only). Is there another way to do this, or is it something that needs to be raised with the laboratory to specify grouping? Or creating a new Chem_code? Thanks Barbara
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Rank: Administration
Groups: Registered, Administrators Posts: 498 Location: Byron Bay Was thanked: 19 time(s) in 19 post(s)
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Hi Barbara, The ranges occur when you have mulitple results for a compound. When grouping by Chem Group this will be visible as a range as all results for a single compound are displayed in the Chem Group for that compound. When grouping by Method Type or Method Name this may not be the case as the Method Type or Method Name values will be different. You are correct, in that if you want to show the Napthalene result twice, once under TPH and once under PAH, the only way to do that, when grouping by ChemGroup is to use a different ChemCode. However, that goes against the purpose of the ChemCodes, which are to identify compounds that are the same, irrespective of their analysis method. An alternative way would be to request the lab to only report the most accurate result, and report that. The Chem Group groupings are defined by you, and are unrelated to the laboratory data. The Method Type and Method Name values are set by the laboratory. Regards, Warwick
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Rank: Newbie
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Location: Perth
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Lab MGTs comment….. Where we have reported both volatile (P&T GCMS) and semivolatile (GCMS) naphthalene data, results may not be identical. Provided correct sample handling protocols havebeen followed, any observed differences in results are likely to be due to procedural differences within each methodology. Results determined by both techniques have passedall QAQC acceptance criteria, and are entirely technically valid. This is correct and it would be preferred to show both results namely for the purposes of correct guideline comparison. However, if we cant, then we should give preference to the VOL result and we will need to manually manipulate the data post-export in either case. I believe more tricks will emerge with the DRAFT NEPM 2010 guidelines and CRC HSLs also. Thanks for the advice though :)
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