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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Standard Solutions01:14

Standard Solutions

Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...

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Related Experiment Video

Updated: Jun 28, 2026

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
06:06

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Published on: August 17, 2016

A new river sediment standard reference material.

M S Epstein1, B I Diamondstone, T E Gills

  • 1Center for Analytical Chemistry, National Institute of Standards and Technology(1), Gaithersburg, MD 20899, U.S.A.

Talanta
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

A new sediment Standard Reference Material (SRM), SRM 2704, was developed for environmental analysis. This certified reference material offers comprehensive elemental characterization for improved accuracy in sediment studies.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Analytical Chemistry

Background:

  • Standard Reference Materials (SRMs) are crucial for accurate environmental monitoring.
  • Previous sediment SRMs had limitations in characterization.
  • The Buffalo River sediment was chosen for its relevance.

Purpose of the Study:

  • To describe the collection, processing, and certification of a new sediment SRM.
  • To provide a highly characterized reference material for elemental analysis.
  • To improve upon previous NIST sediment reference materials.

Main Methods:

  • Careful collection of sediment from the Buffalo River.
  • Rigorous processing and homogenization techniques.
  • Extensive analytical method validation and quality control procedures.

Main Results:

  • SRM 2704 is certified for 25 elements.
  • Information is provided for an additional 22 elements.
  • Enhanced characterization compared to previous sediment SRMs.

Conclusions:

  • SRM 2704 is a valuable, well-characterized sediment reference material.
  • Improved analytical methods and quality control enhance its reliability.
  • This SRM will support more accurate environmental and geochemical studies.