Abstract: LC50-experiments have been conducted using guppies subjected to 72 industrial pollutants. The correlation of the LC50 with several expressions of the hydrophobicity of these chemicals has been studied. Calculated logP(oct) values appeared to satisfy more than HPLC retention indices, solubility data or molecular connectivity indices. One QSAR, with logP(oct) ...

Abstract: In the present work, we report the development of models for the prediction of two fuel properties: flash points (FPs) and cetane numbers (CNs), using quantitative structure property relationship (QSPR) approaches. Compounds inside the scope of the QSPR models are those likely to be found in alternative jet and diesel fuels, i.e., hydrocarbons, alcohols, and ...

Abstract: This paper presents the results of an analysis of the rodent inhalation literature and the development of a quantitative structure–activity relationships (QSAR) model for 4-hour LC50 as baseline toxicity to complement the baseline toxicity model for aquatic animals. We used the same literature review criteria developed for the ECOTOX database which selects ...

Abstract: The reactivity hazard of organic peroxides has been reported as one of the main causes for fire and explosion in process industries. The self-accelerating decomposition temperature (SADT) is one of the most important thermal hazard parameters for risk assessment and safe management of organic peroxides during storage and transportation. This study proposed a ...

Abstract: Draize rabbit eye test scores, as modified maximum average score (MMAS), for 68 pure bulk liquids were adjusted by the liquid-saturated vapor pressure P°. These 68 adjusted scores, as log (MMAS/P°), were shown to be completely equivalent to eye irritation thresholds (EIT), expressed as log (1/EIT), for 23 compounds in humans. Thus, for the first time the Draize ...

Abstract: Developmental toxicity in mouse whole embryo culture assay has been reported for acetic acid (AA) and a series of ten haloacetic acids, including mono-, di-, tri-fluoro (MFA, DFA, TFA), chloro (MCA, DCA, TCA), bromo [MBA, DBA, TEA), and monoiodo (MIA) acetic acids. Benchmark concentrations (BCm), calculated as the lower 95% confidence limit of molar acid ...

Abstract: 50% effective inhibition concentration 48h-EC50 of 40 substituted benzenes to the algae (Scenedesmus obliquus) was determined. The energy of the lowest unoccupied molecular orbital (ELUMO) was calculated by the quantum chemical method MOPAC6.0-AM1. By using ELUMO and the hydrophobicity parameter log Kow the quantitative structure–activity relationship model ...

Abstract: We report methods to predict the intrinsic aqueous solubility of crystalline organic molecules from two different thermodynamic cycles. We find that direct computation of solubility, via ab initio calculation of thermodynamic quantities at an affordable level of theory, cannot deliver the required accuracy. Therefore, we have turned to,a mixture of direct ...

Abstract: Viscosity is an important physical property of ionic liquids (ILs). The viscosities of ILs are relatively high, when compared to those of common organic solvents. It is known that the viscosities of ILs vary widely depending on the type of cation and anion present. A high correlate and simplified quantitative structure–property relationships (QSPR) would offer ...

Abstract: Quantitative structure-activity relationships (QSARs) for skin irritation potential were studied using twenty-four phenols. Based on the hypothesis that skin irritation is induced by reaction of phenols with macromolecules present in epidermal and dermal levels of the skin, the following descriptors for QSAR were selected, the absolute hardness (N) calculated ...