Loading

{
  "id": "MLC-T-CHM-006725",
  "term": "Loading",
  "field": "Chemistry",
  "definitions": [
    "The mass of living test animals per unit volume of test medium held in the exposure vessel, commonly given as grams per liter. Heavy loading lowers dissolved oxygen, raises ammonia and other waste concentrations, and can deplete the test substance through uptake and degradation, so aquatic test guidelines limit it.",
    "Coefficients that describe the relationship between original variables and latent variables in multivariate statistical methods like principal component analysis. They indicate the contribution of each original variable to a principal component. Loadings are often visualized in a loadings plot to interpret the meaning of the components."
  ],
  "subject": [
    "Chemistry and Human Health",
    "Analytical Chemistry"
  ],
  "see_also": [
    "multivariate curve resolution",
    "principal-component analysis",
    "score"
  ],
  "references": [
    "PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 907 (https://doi.org/10.1351/PAC-REC-08-07-09)",
    "PAC, 2016, 88, 407. 'Vocabulary of concepts and terms in chemometrics (IUPAC Recommendations 2016)' on page 420 (https://doi.org/10.1515/pac-2015-0605)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/loading/"
}