Biomedical subjects

L G Ruiz-Suárez

Publications and source records attributed to L G Ruiz-Suárez.

3 recordsLinked to original sources

PubMed2002

Observations of formic and acetic acids at three sites of Mexico City.

Levels of atmospheric carboxylic acids in gas and particulate matter were measured at three sites in Mexico City within the month of March 2000. An annular denuder system was used for sampling and the analytical method was HPLC with UV detection. Formic and acetic acids were present in the PM2.5 fraction and in the gas phase. Total concentration of formic acid was between 0 and 7 ppbV and total concentration of acetic acid was between 1 and 17 ppbV. On average 53% of the formic acid and 67% of the acetic acid were present in particulate matter.

Acetic Acid↗

PubMed2001

Methane emission factors from cattle manure in Mexico.

Factors responsible for methane emission from cattle manure representing diverse climates, systems and functions of cattle production are presented. These factors were obtained by means of an experimental methodology developed for this project. It was considered that the temperature, moisture, handling of manure and the animals' feed ration affect methane production. Drying conditions and fermentation of manure in cool, temperate and warm climates were simulated in the laboratory. Cattle manure was obtained from animals in intensive, semi-intensive and extensive production systems; for dairy, non-dairy and double purpose cattle production functions. Also handling of manure in dry lot, pasture and solid storage was considered. Results suggest that the dominant factor in methane emissions is the feed ration, followed by fermentation temperature and the excreta moisture content. The emission factors obtained in this work are at least a factor of five smaller than those proposed in the revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories for countries like Mexico.

Animals↗

PubMed1997

Modeling methane emissions from cattle in Mexico.

Modeling methane emissions from cattle requires data on herd size, herd distribution by weight and use, and distribution by climate. In this article, it is shown how empirical and semi-empirical models were obtained for these data in Mexico. Some shortfalls in the Tier 2 approach of the 1994 IPCC's methodology for emissions from enteric fermentation are discussed and an intermediate procedure is proposed. These methods could also be applied in other countries.

Animal Husbandry↗