Statistics for analytical chemistry

Hydroxyl radicals (OH) are a key species in atmospheric photochemistry. In the lower atmosphere, up to ~30% of the primary OH radical production is attributed to the photolysis of nitrous acid (HONO), and field observations suggest a large missing source of HONO. We show that soil nitrite can release HONO and explain the reported strength and diurnal variation of the missing source. Fertilized soils with low pH appear to be particularly strong sources of HONO and OH. Thus, agricultural activities and land-use changes may strongly influence the oxidizing capacity of the atmosphere. Because of the widespread occurrence of nitrite-producing microbes, the release of HONO from soil may also be important in natural environments, including forests and boreal regions.

https://science.sciencemag.org/content/sci/333/6049/1616.full.pdf

Soil Nitrite as a Source of Atmospheric HONO and OH Radicals

Several studies have been conducted to evaluate the potentiality of grape residues to be used in the food industry. In the present work, the incorporation of 25, 50 and 75 g/kg of grape marc powder in fettuccini pasta preparation was evaluated over its cooking, nutraceutical and sensory properties. The results show that the incorporation of the dried by-product did not interfere in the water absorption and in the solid loss of the pasta after cooking. The addition of grape marc powder increased the total phenolic, condensed tannins, monomeric anthocyanin and compounds antioxidant capacity concentration in the cooked pasta due to the incorporation of polyphenols stemmed from grape. Sensory analysis showed that the incorporation of grape marc powder reduced the acceptance of aroma, aftertaste, flavor and appearance, regardless of the concentration of the dried residue added. Furthermore, the incorporation of 25 g/kg of grape marc powder presented the best overall acceptance, with lower changes of color, according to the CIELAB method. Based on the results, the addition of grape marc powder to pasta is an interesting alternative of use of this by-product, potentially reflecting on final product costs and representing an environmentally friendly way to manage industrial waste.

The effect of the incorporation of grape marc powder in fettuccini pasta properties

Molecularly imprinted polymer for selective adsorption of diclofenac from contaminated water

Removal of non-point source pollutants from domestic sewage and agricultural runoff by vegetated drainage ditches (VDDs): Design, mechanism, management strategies, and future directions.

Spectrophotometric simultaneous determination of nitrite, nitrate and ammonium in soils by flow injection analysis

Two rapid and sensitive automated methods for the determination of nitrite and nitrate in soil samples

Synthesis and characterization of a molecularly imprinted polymer for the determination of spiramycin in sheep milk.

Evaluation of total phenol pollution in water of San Martin Canal from Santiago del Estero, Argentina.

The metabolism of organic pollutants by plants normally requires contaminant direct uptake by cells. Factors affecting this uptake and the later distribution of chemicals within the plant include the physicochemical properties of the compounds (concentration, structure, solubility, log kow, diffusion rate) and the biochemical characteristics of the plant. This paper reports the tolerance, uptake, and effects of the pesticides carbaryl, linuron, and permethrin on Lupinus angustifolius germination and growth as well as contaminant intraplant distribution and possible degradation. Lupine plants were grown in hydroponic culture containing either 1 or 5 mg of the individual pesticides, or combinations of these (1, 5, or 10 mg of each), in 100 mL nutrient and water solutions. Analysis of the remaining solutions 8 days post-germination showed the water solutions to have higher remaining pesticide concentrations than nutrient solutions. Furthermore, in the presence of pesticides, germination was more frequent in ...

P. Fernández Hernando

Papers

Spectrophotometric simultaneous determination of nitrite, nitrate and ammonium in soils by flow injection analysis

Two rapid and sensitive automated methods for the determination of nitrite and nitrate in soil samples

Synthesis and characterization of a molecularly imprinted polymer for the determination of spiramycin in sheep milk.

Evaluation of total phenol pollution in water of San Martin Canal from Santiago del Estero, Argentina.

Removal of carbaryl, linuron, and permethrin by Lupinus angustifolius under hydroponic conditions.