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: 2005-05-01

    The Tekran 2537 system measures mercury concentration using cold vapor atomic fluorescence spectroscopy (CVAFS).

    Instrumentation: Tekran 2537 analyzer; Tekran 1130 sampler; Tekran 1135 sampler; Campbell Scientific CR3000

    Software: Tekran 2537 analyzer program; Campbell Scientific LoggerNet


  • Started: 2005-05-01

    During the first 2 hours of operation, the Tekran 2537 measures the concentration of gaseous elemental mercury (GEM). These measurements are made directly and are presented as 5-minute averages. Each average results from the operation (i.e. collection and analysis) of one of two cartridges that operate in alternating fashion.

    Instrumentation: Tekran 2537 analyzer; Tekran 1130 sampler; Tekran 1135 sampler; Campbell Scientific CR3000

    Software: Tekran 2537 analyzer program; Campbell Scientific LoggerNet

    Quality Control Measures: As alternating cartridges are used for the measurements, cartridge bias is evaluated as part of data validation


  • Started: 2005-05-01

    Gaseous oxidized mercury (GOM) and particulate-bound mercury of mean diameter less than or equal to 2.5 µm (PBM2.5) are adsorbed onto prepared glassware in the Tekran 1130/1135 speciation modules for two hours while simultaneously, the Tekran 2537A is analyzing gaseous elemental mercury (GEM) by drawing ambient air through the system.

    Instrumentation: Tekran 2537 analyzer; Tekran 1130 sampler; Tekran 1135 sampler; Campbell Scientific CR3000

    Software: Tekran 2537 analyzer program; Campbell Scientific LoggerNet


  • Started: 2005-05-01

    After this two hour period, the system desorbs the glassware by heating the glassware in the speciation modules until the PBM2.5 and GOM are converted to gaseous elemental mercury which can then be detected by the 2537A. During this desorption, the system pumps zero air through the speciation modules so that no ambient air (which could contain mercury) is in the system. After one hour of desorption, the system returns to detecting GEM in ambient air.

    Instrumentation: Tekran 2537 analyzer; Tekran 1130 sampler; Tekran 1135 sampler; Campbell Scientific CR3000

    Software: Tekran 2537 analyzer program; Campbell Scientific LoggerNet

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
lampV_AvgAverage lamp voltage

Average voltage of the lamp in the analyzer during sampling

Measurement type: Ratio
Unit: unavailable
Precision: 0.0000001
RECORDRecord number

Instrument-assigned identification number for the record

Measurement type: Interval
Unit: unavailable
Precision: 1
T1baselnBaseline voltage

Baseline reading emitted by zero air (no mercury)

Measurement type: Ratio
Unit: unavailable
Precision: 0.001
T1blnstdBaseline voltage standard deviation

Standard deviation of the baseline level

Measurement type: Ratio
Unit: unavailable
Precision: 0.001
T1eventSample event

Code indicating the type of sample (elemental, reactive, particulate) assayed

Measurement type: Nominal
CodesForHgSampleEventType
+ show
Appears in data asMeaning of code
0GEM
1Flush
2Pyrolyzer heating
3PBM2.5 heating
4GOM heating
T1HgConcSample concentration

Concentration of mercury in the sample

Measurement type: Ratio
Unit: unavailable
Precision: 0.001
TIMESTAMPRecord timestamp

Time the record was captured

Measurement type: DateTime
Date/Time Format: YYYY-MM-DD hh:mm:ss
time_of_yearDay and time of year

Day of year plus decimal representation of hours, minutes and seconds

Measurement type: Ratio
Unit: unavailable
Precision: 0.0001
TkCartridgeInstrument cartridge sampled

The cartridge within the instrument from which sample was analyzed

Measurement type: Nominal
TkDateInstrument date

Date as set on the instrument

Measurement type: Nominal
TkhourInstrument hour

Hour as set on the instrument

Measurement type: Ratio
Unit: unavailable
Precision: 1
TkminInstrument minute

Minutes as set on the instrument

Measurement type: Ratio
Unit: unavailable
Precision: 1
TkPeakAreaPeak area

Area under the curve recorded by Cold Vapor Atomic Fluorescence Spectroscopy analysis

Measurement type: Ratio
Units: dimensionless
Precision: 1
TkPeakMaxPeak voltage

Maximum voltage obtained during the sample analysis phase

Measurement type: Ratio
Unit: unavailable
Precision: 0.001
TkSmpDurationSample period duration

Duration of the sampling period

Measurement type: Ratio
Unit: unavailable
Precision: 1
TkSmpVolumeSample volume

Volume of the sample analyzed

Measurement type: Ratio
Unit: unavailable
Precision: 1
TkStatusInstrument status code

Code indicating nature of operation of each cartridge

Measurement type: Nominal
TkTimeInstrument time

Time as set on the instrument

Measurement type: DateTime
Date/Time Format: other
TkTypeMode of operation

Type of operation the instrument ran during time period

Measurement type: Nominal
T_2537A_C_AvgAverage temperature of analyzer

Analyzer's average temperature during sampling

Measurement type: Interval
Unit: unavailable
Precision: 0.00001

Sampling Equipment

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

Past Sampling Equipment (No longer in use)

  • Mercury analyzer, data logger
    Started: 2005-05-01
    Ended: 2016-01-04

    Software consists of Tekran 2537 analyzer program and Campbell Scientific LoggerNet

  • Mercury analyzer, sampler, micrologger
    Started: 2005-05-01
    Ended: 2016-01-04

    Tekran 2537 analyzer; Tekran 1130 sampler; Tekran 1135 sampler; Campbell Scientific CR3000

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 in an open field at the Proctor Maple Research Center. Site has a west aspect and an 8% slope

    Minimum Altitude: 399 meter

    Maximum Altitude: 399 meter

Dataset Notes

Notes describing any special conditions or considerations for understanding the quality and consistency of the data


Start Date End Date Note Date Entered
2014-12-05 00:00:002014-12-05 23:59:00Did Argon change, etc. on Tekran system. Normal sampling resumed at 1400.2014-12-05 13:58:00
2014-11-18 11:00:002014-11-18 11:00:00Adjusted lamp voltage back to 9 during 1100.2014-11-24 12:41:00
2014-11-12 00:00:002014-11-12 23:59:00Adjusted Tekran 2537A instrument time to EST just after desorb. Instrument time was one hour advanced. Clock adjustment was at 1012EST.2014-11-12 10:16:00
2014-11-07 00:00:002014-11-07 23:59:00Changed out argon cylinder, soda-lime and filter pack on Tekran sample intake and zero air. Snowing out so 1130 sampling head was left as is until better weather. Next desorb will have about one extra hour of GOM accumulation. Regular sampling will resume at 1200.2014-11-07 11:31:00
2014-10-09 00:00:002014-10-09 23:59:00Changed out argn cylinder,soda lime and filter pack on Tekran system; changed out denuder, external glassware and sample line filter pack in 1130 sampling module. Restarted sampling to check on readings then idled so system it synches at top of hour.Denuder #4 up.Normal sampling will resume at 1600EDT.2014-10-09 15:51:00
2014-10-01 00:00:002014-10-01 23:59:0010-01-2014 MP- Lamp driver voltage indicator lit probably due to power interruption earlier today (0800 hr). Adjusted back to 9V, basline okay. Ran a calibration sampling resumed at 1300 EDT.2014-10-01 12:44:00
2014-09-15 00:00:002014-09-15 23:59:00Computer was off, restarted and resumed TekCap and Loggernet. Reset station clock to local time. Later- changed out argn cylinder,soda lime and filter pack on Tekran system; changed out denuder, external glassware and sample line and zero air filter packs in 1130 sampling module. Sampling restart was delayed because operator neglected to change tanks. Stopped 2537A and changed cylinders then restarted sampling to check on readings then idled so system synchs at top of hour.2014-09-15 16:16:00
2014-08-27 00:00:002014-08-27 23:59:00Adjusted lamp voltage from 14V back to 9V then adjusted offset from .09 to .12.Calibrated. Normal sampling will resume at 1200EDT. Next desorb will have four hours of GOM and PBM accumulation.2014-08-27 11:22:00
2014-07-17 00:00:002014-07-17 23:59:00Lamp voltage indicator lit so lamp voltage was adjusted back to ~9V. Re-calibrated instrument after voltage adjustment, normal sampling resumed at 1200. Mowing at site from ~1000 to noon. The mowing should have little mpact on mercury readings since the analyzer was idiled for calibration and waiting for the top of the hour. There are an extra 16 adsorb cycles in the 1400 to 1500 desorb, however.2014-07-17 11:28:00
2014-06-16 00:00:002014-06-16 23:59:00Mark Olsen from AMNet at site today. Worked on 2437A and replaced RPF in 1135 module. Site audit will be this coming Thursday.2014-06-16 15:59:00
2014-04-29 00:00:002014-04-29 23:59:00Computer was restarted after scheduled updates. Desorb looked bad; no difference from normal GEM sampling. Suspected power interruption to 1130 sampling module, moved plug to different outlet, seems OK now. First desorb after power interruption will have more adsorb, next one should be normal.2014-04-29 10:46:00
2014-04-28 00:00:002014-04-28 23:59:00Changed out argon, sodalime and filterpack on Tekran system; replaced denuder,external glassware and sample line filter in 1130 pump module. Normal sampling set to resume at 1800 EST.2014-04-28 16:52:00
2014-04-09 00:00:002014-04-09 23:59:00 Changed out argon, filter pack, and soda lime on Tekran system. Changed out denuder (#3 on) filter pack, external glassware in 1130 sampling module. Normal sampling resumed at 1200EST.2014-04-09 13:21:00
2014-04-07 00:00:002014-04-07 23:59:004-07-2014 - Replaced gold traps after isolating problem to "A" side. Loosened downstream fitting on A but nothing changed then loosened upstream side, pump ran quietly. Sampling restarted at 1800EST2014-04-09 13:19:00
2014-04-04 00:00:002014-04-04 23:59:004-04-2014- Replaced entire V2 valve assembly. Will mark removed one for refurbishing. Normal sampling resumed 1200EST. Checked site later, pump still laboring on one side, idled system.2014-04-09 13:16:00
2014-03-28 00:00:002014-03-28 06:59:003-28-2014 MP- All zeroes in the 2437A hg data. Sample flow zero, 2537A pump shot. A and B flow bias before complete failure. Idled system.2014-04-03 16:23:00
2014-03-25 00:00:002014-03-25 23:59:00Replaced pump diaphragm in the 1130 pump module then adjusted lamp voltage in 2537A. Re-calibrated; normal sampling resumed at 1500EST.2014-03-26 10:27:00
2014-03-07 00:00:002014-03-13 00:00:003-07-2014 MP- Changed some parameters according to Mark Olsen's instructions. The 2537A was autocalibrating after each desorb. Changed round time from 5 to 60 minutes on 2537A instrument panel; changed calibration schedule from 8 to 24cycles on 1130 controller. Next sample time (displayed on 2537A screen) is correct. Will check back to make sure. 3-13-14 MP- Tekran schedule was good from 3-07-14 to 3-10-14 at 1300 then reverted to calibrating after each desorb. This is because operator found a setting on the front panel that allowed entering the time for next calibration but the Auto Cal function was not turned off. After conferring with program liaison on 3-12-14, operator was able to find the place where the auto cal could be set to no. System timing is O.K. today.2014-03-13 14:00:00
2014-03-07 00:00:002014-03-07 23:59:00Changed some parameters according to Marl Olsen's instructions. The 2537A was auto calibrating after each desorb. Changed round time from 5 to 60 minutes on 2537A instrument panel; changed calibration schedule from 8 to 24 cycles on 1130 controller. Next sample time (displayed on 2537A screen) is correct. Will check back to make sure. LATER- Sampling started at the top of the hour as is correct. Will check back to see if the too-frequent calibrations have stopped.2014-03-07 14:02:00
2014-03-06 00:00:002014-03-06 23:59:00Changed out soda lime filter and pack on Tekran system, changed out argon. Changed out denuder, external glass ware and filterpack in 1130 sample module. Sampling resumed at 1318, not the top of the hour. This needs to be fixed; will contact program office for help.2014-03-06 16:30:00
2014-03-05 00:00:002014-03-05 23:59:00Switched in 2537A S/N 0215. Powered up at 1500 and calibrated. Sampling resumed at 1500. Data suspect at least until after the next desorb cycle.2014-03-06 16:29:00
2014-03-03 00:00:002014-03-03 23:59:00 Powered down 2537A S/N 0178. Analyzer was malfunctioning all zeroes and no peaks. Lots of flashing lights inside.Main circuit board had red flashing lights on zero, A/B, Bypass, SRC, SFLSH, C-FAN. Temp indicator on lamp driver block flashing green. Perm and Zero indicators on 2537A front panel were flashing.2014-03-06 16:25:00
2014-02-03 00:00:002014-02-03 23:59:00Changed out Argon, soda lime and filter pack on zero air out: changed inlet soda lime on Tekran system. Changed Denuder, denuder to RPF union and sample line filter pack in 1130 sampling module. Sampling resumed at 1300 EST.2014-02-03 13:03:00
2014-01-22 00:00:002014-01-22 23:59:00Changed out inlet soda lime about one hour into GOM adsorb. Extra hour of accumulation should be taken into account for next desorb. Sampling will resume at 1600.2014-01-22 15:07:00
2013-12-04 00:00:002013-12-04 23:59:0012/04/13 MP- Desorb showing zeroes. 1135 controller displays unlit, checked power to module and reset 1135 GFI outlet in shelter. It was triggered and reset during 1100 hour. Controller displays illuminated. First particulate readings will be high because this problem wasn't caught right away.2013-12-04 11:36:00
2013-11-25 00:00:002013-11-25 23:59:0011/25/2013 MP- Data capture and daily log were off. Restarted data capture and opened log, restarted Loggernet. Changed out argon, inlet soda lime (batch #A09Z023)zero air soda lime and filter pack and 1130 glassware, sample line filterpack on Tekran system. Denuder #4 is on. Sampling was interrupted from 1100 to 1300.2013-11-25 15:30:00
0000-00-00 00:00:000000-00-00 00:00:00Power outage overnight; restarted computer and set station clock to EST.2013-11-11 13:46:00
0000-00-00 00:00:000000-00-00 00:00:004-03-2014 MP-Replaced pump in 2537A, According to AMNet pump failure is due to clog in V2 valve. Will change V2 before restarting system.2014-04-03 16:26:00
0000-00-00 00:00:000000-00-00 00:00:001153 - GFI outlet tripped again so 1135 was plugged into different outlet and is working.2013-12-04 11:52:00
0000-00-00 00:00:000000-00-00 00:00:00Computer back at password screen, changed automatic update setting to every Weds at 0800. Setting was every night at 0300.2013-11-26 09:54:00