Environmental data: How do you associate surrogates with targets for methods like 8270 and 8260?

e.g., if the recovery of SVOC surrogate 2,4,6-tribromophenol is low in method 8270, which compounds would you consider to be impacted? All the acid-extractables, only acid-extractables within similar RTs, or compounds that are quantitated under the same internal standard that TBP is?

There is some disagreement about whether being in the same IS grouping is relevant.

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