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The investigation of atrazine adsorption-desorption on smectite surfaces occurs through the relatively weak van der Waals and H bonds. The rate of adsorption on clays was inversely proportional to the surface change density (SCD) of the smectites. The investigation involves the determination of adsorption and desorption of atrazine on 11 different smectite and a soil smectite samples. The desorption and adsorption processes of these smectite samples are reversible.

Soil conservationists began systematic study of ephemeral gully erosion only in the last decade (5). Ephemeral gullies are scoured by concentrated flow, but unlike rills, ephemeral channels are believed to [...]

Pesticide adsorption in soil microstructure account for the level of retention. Smectite samples were studied to determine the atrazine reactivitiesof this clay type. Samples were subjected to chemical analysis after dispersionand drying. Freundlich adsorption isotherms were generated for each sample following the batch equilibrium method to measure adsorption. Atrazine adsorption ranged from zero to 100% in smectite clays, with the Freundlich adsorption constant declining in tandem with the values for cation exchange capacity. The study indicates that atrazine is dominantly adsorbed by smectitesas a neutral species.

ABSTRACT: Time domain reflectometry (TDR) has changed the way researchers measure soil water content. A technology similar to TDR, called frequency domain reflectometry (FDR) can now he applied to practical [...]

The collapse of ultrasonically‐generated cavitation bubbles can result in sonochemical reactions. The kinetics of sonochemical decomposition of alachlor and atrazine in water were determined using a sonicator operating in the continuous mode at maximum output. Alachlor and atrazine solutions, 3.1 nmol L‐1, were kept at constant temperature during the sonication. Decomposition at 30°C followed first‐order kinetics: k = 8.01 × 10‐3 min‐1 and 2.10 × 10‐3 min‐1 for alachlor and atrazine, respectively. It is not clear from the product analysis whether the decomposition was due to a thermal or free radical reaction. However, regardless of the decomposition mechanisms, the extrapolated half‐lives (86 and 330 min for alachlor and atrazine, respectively) support the potential development of ultrasonic waves to decompose herbicides in contaminated water. [ABSTRACT FROM PUBLISHER]