Dataset: Microsensor profiles - pH

Name: pH from microsensor profiles of ex situ sediment cores collected in the Chesapeake Bay and measured during 2017-2018
Published: 2021-04-07
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.847923.1

Spatial Extent: N:38.55728 E:-76.42794 S:38.55505 W:-76.49402

Temporal Extent: 2017-03-28 - 2018-08-24

Project:

Collaborative Research: Probing the Metabolic and Electrical Interactions of Cable Bacteria in Anoxic Sediments (Anoxic Sediment Bacteria Interactions)

Principal Investigator:

Sairah Malkin (University of Maryland Center for Environmental Science, UMCES/HPL)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-04-07

Restricted:

Validated:

Yes

Current State:

Final no updates expected

pH from microsensor profiles of ex situ sediment cores collected in the Chesapeake Bay and measured during 2017-2018

Abstract:

This dataset includes pH from microsensor profiles of ex situ sediment cores collected in the Chesapeake Bay and measured during 2017-2018.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-04-07	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.847923.1	2021-04-26

Methods & Sampling

Methodology:
High-resolution microsensor profiling of O₂, pH, and H₂S was performed on replicate sediment cores retrieved from the sampling sites, with 1 or 2 replicate profiles made per sediment core per analyte, using commercial microsensors operated with a motorized micromanipulator (Unisense A.S., Denmark). pH sensors were calibrated with a 3-point NBS buffer calibration. Detailed methodology is given in Malkin et al., 2014.

Sampling and Analytical Procedures:
Replicate sediment cores were collected using a gravity corer (Uwitec; clear PVC liners, Ø = 8.6 cm), capped, kept in the dark at bottom water temperature in a water bath, and transported back to the laboratory, where they were held in a climate-controlled room. Microsensor profiling was conducted within 1 day of core retrieval.

Instruments:
Unisense A.S. microsensors (Denmark) and motorized micromanipulator system were used for data collection. The 4 channel microsensor multimeter was used, with the following microsensors: Ox-50, pH-200, and H2S-100. Each sensor was used consecutively and so resultant data is provided separately as individual datasets. SensorTrace Suite software was used for data collection.

Data Processing Description

BCO-DMO Processing:
- changed date format to YYYY-MM-DD;
- converted longitude from positive degrees West to negative degrees East.

Data Files

File
pH.csv (Comma Separated Values (.csv), 878.05 KB) MD5:672bc198687d25240f4887532b7e9411 Primary data file for dataset ID 847923

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1756877
NSF Division of Ocean Sciences	OCE-1756851

Deployments

None available yet

Instruments

Gravity Corer

Supplied Name: gravity corer (Uwitec)

Supplied Description:

Instrument Type

Generic Name: Gravity Corer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/51/

Generic Description:

The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. (http://www.whoi.edu/instruments/viewInstrument.do?id=1079).

Unisense pH microelectrode

Supplied Name: Unisense A.S. microsensors (Denmark)

Supplied Description:

Unisense A.S. microsensors (Denmark) and motorized micromanipulator system were used for data collection. The 4 channel microsensor multimeter was used, with the following microsensors: Ox-50, pH-200, and H2S-100. Each sensor was used consecutively.

Instrument Type

Generic Name: Unisense pH microelectrode

Acronym: Unisense pH

Generic Description:

The Unisense pH microelectrode is a miniaturized conventional pH electrode. The instrument is designed for research applications. It is based on selective diffusion of protons through pH glass, and the determination of potentials between the internal electrolyte and an internal or external reference electrode. It has a range of tip sizes (10 um-1.1 mm), a measurement range of pH 2-10 (linear 4-9) and detection limit of 0.1 pH unit. See more on the manufacturer's website: https://www.unisense.com/

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
date_local	date of field sampling (local time zone; EST); format: YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Year	year of field sampling	unitless	year
Month	month of field sampling	unitless	month
Day	day of month of field sampling	unitless	day
site	site of sediment collection	site	site
lat	latitude	degrees North	lat
lon	longitude	degrees East	lon
site_depth	depth of sampling site	meters (m)	depth_w
CoreRep	core replicate (A or B)	unitless	replicate
ProfileRep	replicate profiles within a core (A or B)	unitless	replicate
sensor_depth_mm	depth of microsensor	millimeters (mm)	depth_core
value_pHNBS	calibrated value of pH microsensor	calibrated NBS standard	pH
Flag	indication of measurement problem or caution	unitless	q_flag

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Dataset: Microsensor profiles - pH