TOC analysis

Knowledge graph centered on TOC analysis with 75 nodes and 209 connections. Top connected: USGS Water Data for the Nation, Atriplex canescens, Distinct Source Water Chemistry Shapes Contrasting, Bacteria, snowpack persistence.

Method synopsis

Comprehensive chemical analysis of water samples including major ions, trace metals, and conservative tracers using multiple analytical techniques. Includes field measurements and laboratory analyses with quality control procedures.

Synthesized from method descriptions across 13 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Single-Well Push–Pull Tracer Test Analyses to Determine Aquifer Reactive Transport Parameters at a Former Uranium Mill Site (Grand Junction, Colorado) (2023), Minerals. The protocol was originally introduced by Significant stream chemistry response to temperature variations in a high-elevation mountain watershed (2020), Communications Earth & Environment. DOI: 10.1038/s43247-020-00039-w. Implementations in other papers (listed below) may differ.

1. Sample collection and field analyses
   Injection water, prepumping groundwater, drift phase, and postpumping samples were collected. During pumping, 60 mL samples were continuously collected with autosampler via split pumping line for hourly samples. Field analyses included temperature, specific conductance, pH, ORP, and dissolved oxygen measurements.
   Quantities: 60 mL samples collected hourly during pumping, with additional samples at specific test phasesDuration: Continuous sampling during pumping phases, discrete sampling during other phasesConditions: Field analyses performed at least once daily using field multimeter and probe
   Equipment: peristaltic pump, plastic tubing, autosampler, YSI 556MPS field multimeter and probe, flow-through cell
2. Laboratory chemical analyses
   Samples were split into two aliquots - one kept at 4°C for anion analysis by ion chromatography, and one acidified to pH < 2 for cation and metal analysis by ICP-OES. Trace metal analyses included Mo, Mn, Se, Sr, Li, and V, with uranium analysis by kinetic phosphorescence. Tracer analyses performed by high-performance liquid chromatography.
   Quantities: All samples analyzed in duplicate with 0.45 micrometer filtrationDuration: Analyses completed following LM Grand Junction Environmental Sciences Laboratory procedure manual

Typical Equipment

• YSI 556MPS field multimeter
• ion chromatography
• ICP-OES
• ThermoFisher Ultimate 3000 HPLC

Output Measurements

• pH
• alkalinity
• major cations and anions
• trace metals
• uranium concentrations
• tracer concentrations

Papers Using This Protocol (13)

Species Studied With This Protocol

Places Where Used