Details and Metadata

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Methods

The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures

Current Methods


  • Started: 1992-12-15

    Year-round daily wet-only precipitation sampling, every sixth day aerosol and vapor phase sampling (24 hour sample). Measurements include: total Hg in precipitation, vapor and particulate phases, 24 other trace elements.



  • Vapor phase sampling ended in September 2001.

Past Methods (No longer in use)


  • Started: 1995-01-01
    Ended: 2001-12-31

    24-hour sample of air collected every 6th day to measure vapor phase levels of mercury


  • Started: 1992-12-15
    Ended: 1994-10-05

    24-hour sample of air collected every Wednesday and every 6th day to measure vapor phase levels of mercury

    Instrumentation: Gold-coated sand vapor traps


  • Started: 1992-12-15
    Ended: 1995-02-04

    Samples shipped to University of Michigan Air Quality Lab for analysis by cold vapor atomic fluorescence spectrometry

Dataset Fields

Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data


Field Name Caption Description Additional Information
BatchBatch ID

Batch group ID

Nominal
DateOnDate Trap Put On

Date that the gold trap was put out for sampling

DateTime Date/Time Format: YYYY-MM-DD
TimeOnTime Trap Put On

Time the gold trap was put out to sample

DateTime Date/Time Format: hh:mm
siteSite Code

Site code

Nominal
samplenumberSample Number

Sample Number

Ordinal
samplevolumeSample Volume

Volume of the sample collected

Ratio Units:
STPcorrected_sampVolCorrected Sample Volume

Volume of the sample corrected to standard temperature and pressure (1013.25mb at 25C)

Ratio Units:
VolumeUnitsVolume Units

Units used for reporting volume

Nominal
Duration_minSample Duration

Duration of sampling

Ratio
Unit: minute
Precision: 1
BlankBlank Mercury Concentration

Mercury found on the field blank

Ratio Units:
STP_corrected_ResultMercury Concentration (Corrected)

Concentration of mercury, corrected to standard temperature and pressure (1013.25mb at 25C)

Ratio Units:
UnitUnits

Units used to report concentrations

Nominal
NonSTPcorrectedResultMercury Concentration (Corrected)

Concentration of mercury, not corrected

Ratio Units:

Sampling Equipment

Equipment and software used to collect data, including how that equipment was used.

Past Sampling Equipment (No longer in use)

  • Trap
    Started: 1992-12-16
    Ended: 2006-08-27

    Gold plated glass bead trap

Site Characteristics

The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection

  • Site Description

    West slope of Mount Mansfield at the Proctor Maple Research Center.