Response to comment on "Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substance: The Effects of Dissolved Oxygen on Quenching Processes." (reply to Sarah A. Green and Neil V. Blough in this issue, p. 1407)

Article Abstract:

Environmental factors could not have affected the fluorescence lifetime data in a study of the effects of dissolved oxygen on quenching processes. Small samples made two days ahead of the analysis and stored in the refrigerator negate the theory of undersaturation of dissolved oxygen prior to the experiment or fluctuations in temperature. Temperature-induced changes in the dissolved oxygen concentration, meanwhile, explain the magnitude of variability in the precision of data. The pitfalls of fitting data to the later half of the decay curves are acknowledged.

Fluorescence, Solubility

---

Association of linear alkylbenzenesulfonates with dissolved humic substances and its effect on bioavailability

Article Abstract:

Fluorescence quenching and ultra-centrifugation techniques were used to determine the association of linear alkylbenzenesulfonates (LAS) with dissolved humic substances (DHS). Both techniques can be used to measure the effects of DHS on the speciation of LAS in natural waters. Toxicity studies which examined the effects of DHS on the bioavailability to the fathead minnow Pimephales promelas indicated that DHS can alter the bioavailability of LAS to aquatic organisms.

Surface active agents, Alkylbenzene Sulfonates NEC, Surface Active Agent Manufacturing, Soils, Soil chemistry, Alkylbenzene sulfonate, Bioavailability

---

Solubility enhancement and fluorescence quenching of pyrene by humic substances: the effect of dissolved oxygen on quenching processes

Article Abstract:

Pyrene-humic substance partition coefficients measured by the solubility enhancement (SE) and fluorescence quenching (FQ) techniques were comparatively analyzed. Nonstatic quenching processes were measured using fluorescence lifetime data to determine differences between the SE and FQ methods. The results showed that there was no significant difference between values derived using SE and FQ techniques.

Humic acid

Similar abstracts:

• Abstracts: Can combination therapy overcome drug resistance? Results on new AIDS drugs bring cautious optimism. Drug companies join forces in search for AIDS therapy
• Abstracts: Comparison of the in situ and desorption sediment-water partitioning of polycyclic aromatic hydrocarbons and polychlorinated biphenyls
• Abstracts: Fatigue gage utilizing surface roughening of aluminum foil. On the decrease of fatigue limit due to small prestrain
• Abstracts: Micellar solubility and micelle water partitioning of polychlorinated biphenyls in solutions of sodium dodecyl sulfate
• Abstracts: Competitive interactions among components of humic acids in granular activated carbon adsorption systems: effects of solution chemistry

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.