A Device to Collect Sediment Cores: And an Experiment for their Chemical Analysis

Abstract

The chemical and physical characterization of sediments in aquatic systems can be performed at the introductory chemistry level and the experience is appealing and informative for students. This paper describes a device used to gather samples.

Acid Volatile Sulfides (AVS) in Sediment: An Environmental Chemistry Experiment

“…Seasonal changes in AVS may be measured by freezing samples collected monthly over several seasons. To obtain a sulfide profile of the sediment with depth, a sediment core obtained with the simple coring device described recently in this Journal (6) may be divided into 1or 2-cm sections and analyzed for AVS. Since sulfides are readily oxidized, handling of the sediment is important for good results.…”

Assembling and Using an LED-Based Detector To Monitor Absorbance Changes during Acid–Base Titrations

“…However, it seems that the most focused subject concerning the use of LEDs is the assembling of photometric devices. , Wendlandt proposed a colorimeter in which a green LED was the light source in order to minimize costs in teaching laboratories. Similarly, Dämmgen and Keune used a standard light projector as a spectroscope, and Deldelumyea proposed an LED-based device to demonstrate the principles of photometry with three basic experiments.…”