1 / 7

AMQAW Meeting

AMQAW Meeting. Comments on Mainstem Replicate Sampling Procedure June 2006. NUTRIENT CONCENTRATIONS Comparisons Among Estuaries Data assembled by NASL staff Summary developed by Jerry Frank Very large range in concentrations in USA estuaries

trisha
Download Presentation

AMQAW Meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. AMQAW Meeting Comments on Mainstem Replicate Sampling Procedure June 2006

  2. NUTRIENT CONCENTRATIONS • Comparisons Among Estuaries • Data assembled by NASL staff • Summary developed by Jerry Frank • Very large range in concentrations in USA estuaries • Generally highest in winter and lowest in fall • Generally highest in oligohaline areas and lowest in lagoons

  3. NH4 before Field Technique Changes 20% error 7uM

  4. NH4 after Field Technique Changes • Wear gloves • cup rims not touched • rinsing of cups and caps • cup arrangement in rack 20% line 7 uM

  5. SAV Criteria Way out there 0.014 mg/l 0.14 mg/l

  6. DIN Criteria • SAV DIN Criteria = 11 uM (0.15 mg/l) • MDLs for NH4 range from 0.6 to 0.9uM • Detection is great relative to criteria • Main interest is with higher values (bad WQ for SAV) where replicate variability is low (<5%)

  7. Summary • Changes in field procedures have helped • Basic advantage of in-field stabilization, esp for NH4 which is very reactive • Most replicate variability at very low concentrations (occasionally a lot of very little) • Replicate variability does not seem to influence several uses of monitoring data • Continue emphasis in careful field and lab procedures

More Related