Related Experiment Video
Updated: Mar 22, 2026

Electrostatic Method to Remove Particulate Organic Matter from Soil
Published on: February 10, 2021
INFLUENCE OF METHOD FOR REMOVAL OF SESTON ON THE DISSOLVED ORGANIC MATTER. II. COBALAMINS
1Department of Botany, Washington University, St. Louis, Missouri 63130.
Abstract:
Comparisons of the 3 previously used methods (continuous flow centrifugation, Millipore®filtration, and biodialysis) for making water samples seston-free before analysis for cobalamins point to several likely sources of error: (a) unpredictable occlusion of pores in Millipore®membranes during filtration; (b) irreversible adsorption of cobalamins by Millipore®membranes; (c) probable cell injury and leakage by centrifugation. Some water samples gave good agreement on soluble vitamin B12 by all 3 methods, while other samples had appreciable discrepancies. The validity of total vs. sestonic cobalamin determinations therefore is questioned. One lake had time-dependent fluctuation in soluble cobalamin.
More Related Videos
08:57VacuSIP, an Improved InEx Method for In Situ Measurement of Particulate and Dissolved Compounds Processed by Active Suspension Feeders
Published on: August 3, 2016
09:38Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
Related Concept Videos
Marine Microbial Ecology
Freshwater Microbial Ecology
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Entropy and Solvation