Tania Mascarenhas Tavares

Universidade Federal da Bahia · Departamento de Química Analítica

The study evaluates Hermetia illucens larvae’s ability to decrease direct methane emissions and nutrients from cattle and swine manure. Hermetia illucens larvae were put into fresh cattle and swine manure, and the same conditions, without larvae, for the control treatment were established. The methane emissions were measured until the first prepupa...

A primary lead smelter operated in Santo Amaro City in Brazil from 1960 to 1993, leaving approximately 500,000 tons of industrial dross containing 2-3% of lead and other toxic elements that contaminated the industry grounds and the urban environment. This study aimed to present the local residents' perception towards soil contamination by the smelt...

The Todos os Santos Bay is the second largest bay on the Brazilian coast. Its northeast shore is home to active oil processing, metallurgical and other activities, including a petrochemical complex. Salvador, capital of Bahia state, is on the peninsula that separates the bay from the Atlantic. The bay is shallow with an area- weighted depth of 9.8...

O norte do Recôncavo baiano abriga intensa atividade de petróleo. O objetivo deste trabalho foi verificar a presença dos 16 Hidrocarbonetos Policíclicos Aromáticos (HPAs) considerados poluentes prioritários pela Environmental Protection Agency (EPA), em amostras de água de 12 poços freáticos de uso individual e coletivo dos municípios de São Franci...

O objetivo deste estudo foi avaliar a contaminação de 24 HPAs em sedimentos superficiais, em zonas de infra e mesolitoral, identificar as possíveis fontes desses compostos e avaliar os impactos causados na zona costeira da Baía de Todos os Santos, Bahia - Brasil. As análises foram realizadas em um cromatógrafo a gás, acoplado a um espectrômetro de...

O litoral Norte da Bahia está sujeita a atividades industrias, turísticas e urbanas. A presença de três emissários submarinos contendo rejeitos sanitários e industriais, caracteriza o forte impacto para a região. Os HPAs Constituem uma família de compostos orgânicos caracterizados por possuírem dois ou mais anéis aromáticos condensados. O fato do l...

Este trabalho avaliou as concentrações de HPAs em sedimentos de mesolitoral, de 23 estações no entorno da Baía de Todos os Santos, Bahia/Brasil, fontes e a variação temporal destes compostos na região. A concentração total nos sedimentos variou de 1,3 a 4021 ngg-1 (peso seco). Dentre os 16 HPAs, os de maior frequência foram o naftaleno e o pireno,...

Purpose The Todos os Santos Bay is the largest bay in Brazil and receives drainage from various watersheds. For more than 450 years, it was the main destination for the domestic and hospital sewage from the city of Salvador, Bahia. With the growing concern regarding the presence of pharmaceutical and personal care products (PPCPs) in the environmen...

In a contaminated terrain of 432.6 ha located in San Luis Potosi, Mexico, where lead and copper smelters and an arsenic trioxide plant had operated for nearly a century, the geochemical behavior of arsenic in soils and wastes was studied and field experiments conducted in order to stabilize this element. The analyses indicated that most of the soil...

Studies of chemical speciation and phase fractionation of atmospheric inorganic compounds of N, S and Cl have been undertaken in the atmosphere of the Reconcavo Baiano. The objectives were to determine the enrichment of the clean air masses coming from the Atlantic by different chemical species resulting from NO2 SO2, HCl and NH3 emissions from the...

Studies of chemical speciation and phase fractionation of atmospheric inorganic compounds of N, S and Cl have been undertaken in the atmosphere of the Reconcavo Baiano. The objectives were to determine the enrichment of the clean air masses coming from the Atlantic by different chemical species resulting from NO 2 SO 2, HCl and NH 3 emissions from...

The assessment of damage to indoor cultural heritage, in particular by pollutants, is nowadays a major and growing concern for curators and conservators. Nevertheless, although many museums have been widely investigated in Europe, the effects of particulate matter and gaseous pollutants in museums under tropical and subtropical climates and with di...

Reduced sulfur compounds, RSCs (H2S, COS, CH3SH, CH3SCH3, CS2 and CH3S2CH3) play a role in global cycle and acid rain formation. At trace levels RSCs in air are difficult to collect, store and analyze because of their highly adsorptive and reactive properties. This work optimizes parameters of sampling and instrumental determination of RSCs for urb...

Traditionally the monitoring of atmospheric pollutants is aimed at managing accidents and short-term actions for the protection of human health on local and regional scales. These monitoring networks required continuous measurements with high time resolution, involving costly equipment, operation and maintenance. More recent simulations with mathem...

Reduced sulfur compounds, RSCs (H 2 S, COS, CH 3 SH, CH 3 SCH 3 , CS 2 and CH 3 S 2 CH 3) play a role in global cycle and acid rain formation. At trace levels RSCs in air are difficult to collect, store and analyze because of their highly adsorptive and reactive properties. This work optimizes parameters of sampling and instrumental determination o...

Organic tin compounds were investigated in the sediment of twenty-four stations located in the Todos os Santos Bay and the north coast of Bahia - Brazil. The concentration of these organic tin was also determined in a ascidium species of Phallusia nigra. The speciation and quantification was performed by GC-MS/MS. The highest concentrations were: t...

The promotion of good indoor air quality in schools is of particular public concern for two main reasons: (1) school-age children spend at least 30% of their time inside classrooms and (2) indoor air quality in urban areas is substantially influenced by the outdoor pollutants, exposing tenants to potentially toxic substances. Two schools in Curitib...

Neste trabalho foi avaliada a eficiência de coleta de n-alcanos nas fases gasosa e particulada da atmosfera, com equipamento adaptado para esta finalidade. O protocolo analítico desenvolvido mostrou-se adequado ao tipo de estudo proposto, e pode ser utilizado para coleta e análise de outros grupos de compostos orgânicos semi-voláteis. Verificou-se...

In the Recôncavo of Bahia (located between 12 degrees 33' and 13 degrees 10'S and 38 degrees 00'and 39 degrees 00'W), there are significant discharges of SO(2) and NO(x) due to local, industrial and urban activities. The incoming air masses from the Atlantic Ocean are enriched with seaspray, which neutralizes part of the rain acidity. The extent of...

Resumo Os bifenilos policlorados (PCBs) são compostos organoclorados sintéticos com principal uso como óleos isolantes elétricos de transformadores e capacitores. São também chamados de Ascaréis. Na década de 80 foi constatado que PCBs são compostos orgânicos persistentes no meio ambiente, tóxicos e apresentam dioxinas como contaminantes. Nesta épo...

The effect of leaf age on the formaldehyde (HCHO) and acetaldehyde (CH 3CHO) exchange pattern of the deciduous Amazonian tree species Hymenaea courbaril was investigated under field conditions. Branch enclosure measurements on senescent, young, and mature leaves showed that leaf development had a pronounced impact on the aldehyde exchange behavior...

The performance of a passive sampler was tested under exposure in Teflon chamber. The SO2 trapped in impregnated filter with 1.0 x 10-2 mol L-1 Na2CO3 solution was extracted in ultrasound bath with H2O2 solution for 15 min and determined as SO42- by ion chromatography. The sampler presented good performance except for air in total stillness conditi...

Atmospheric concentrations of several reduced sulphur compounds (H2S, COS, CH3SH, CH3SCH3, CS2) originating from both natural and anthropogenic sources were measured at a number of locations in the All Saints Bay area and Reconcavo Baiano, Brazil. The volatile reduced sulphur compounds were collected by pre-concentration using cryo-tubes. Analysis...

O desempenho de um amostrador passivo foi testado sob exposição em câmara de Teflon. O SO 2 fixado no filtro impregnado com solução de Na 2 CO 3 1,0 x 10-2 mol L-1 foi extraído com uso de banho de ultra-som e solução de H 2 O 2 durante 15 min, e determinado como SO 4 2-por cromatografia iônica. O amostrador apresentou bom desempenho, exceto sob con...

Passive samplers have been widely used for over 30 years in the measurement of personal exposure to vapours and gases in the workplace. These samplers have just recently been applied in the monitoring of ambient air, which presents concentrations that are normally much smaller than those found in occupational environments. The locally constructed p...

As a part of the LBA-EUSTACH (European Studies on Trace Gases and Atmospheric CHemistry as a contribution of the Large-scale Biosphere-Atmosphere experiment in Amazonia) project, the exchanges of formaldehyde (HCHO) and acetaldehyde (CH3CHO) between Amazonian vegetation and the atmosphere were investigated by branch enclosures and compared with gra...

Abstract Whereas for extra-tropical regions model estimates of the emission of volatile organic compounds (VOC) predict strong responses to the strong annual cycles of foliar biomass, light intensity and temperature, the tropical regions stand out as a dominant source year round, with only little variability mainly due to the annual cycle of foliar...

Passive samplers have been widely used for over 30 years in the measurement of personal exposure to vapours and gases in the workplace. These samplers have just recently been applied in the monitoring of ambient air, which presents concentrations that are normally much smaller than those found in occupational environments. The locally constructed p...

In view of the significance of environmental analytical data, it is essential that the quality of both sampling strategy and analysis be assured and that procedures used, as well as all relevant additional information, are reported. There is a minimum level of information required in order to guarantee the fitness-for-use of the data. Emanating fro...

Measurements of gaseous SO2, NH3, and O3 using IVL passive sampler technology were obtained during a pilot measurement program initiated as a key component of the newly established WMO/GAW Urban Research Meteorology and Environment (GURME) project. Monthly measurements were obtained at 50 stations in Asia, Africa, South America, and Europe. The med...

To determine the blood lead levels in children living near an inactive lead foundry in the city of Santo Amaro da Purificação, state of Bahia, in September of 1998; and to identify factors associated with differences in these levels. Cross-sectional study with children between 1 and 4 years of age living within 1 km of the lead foundry. Mothers or...

In view of the significance of environmental analytical data, it is essential that the quality of both sampling strategy and analysis be assured and that procedures used, as well as all relevant additional information, are reported. There is a minimum level of information required in order to guarantee the fitness-for-use of the data. Emanating fro...

OBJETIVO: Determinar os níveis de chumbo no sangue de crianças que moravam próximo a uma fundição de chumbo desativada na Cidade de Santo Amaro da Purificação, Estado da Bahia, em setembro de 1998; e identificar fatores associados à variação destes níveis. MÉTODOS: Estudo de corte transversal com crianças de 1 a 4 anos de idade que residiam a menos...

As part of the project LBA-EUSTACH (European Studies on Trace gases and Atmospheric Chemistry as a contribution to the Large- Scale Biosphere-Atmosphere experiment in Amazonia), the exchange of formic acid and acetic acid between vegetation and the atmosphere was investigated in the wet-to-dry season transition and the dry-to-wet season transition...

We measured atmospheric gas-phase volatile organic compounds (VOCs) at the end of the wet and end of the dry season at a tropical rainforest site in Rondonia, Brazil, using various sampling techniques such as trapping on different adsorbents or cryogenic trapping combined with appropriate analysis techniques. The measuring sites were located inside...

As part of the project LBA-EUSTACH (European Studies on Trace gases and Atmosphere Chemistry as a contribution to the Large- Scale Biosphere-Atmosphere experiment in Amazonia), we examined the diel pattern of isoprenoid exchange in the wet season of 1999 at a remote field site in Rondonia, Brazil. The emission pattern of two tree species in a secon...

The use of alcohol fuel has received much attention since 1980s. In Brazil, ethanol-fueled vehicles have been currently used on a large scale. This paper reports the atmospheric methanol, ethanol and isopropanol concentrations which were measured from May to December 1997, in Osaka, Japan, where alcohol fuel was not used, and from 3 to 9 February 1...

Foram aqui determinados os níveis e a distribuição geográfica dos compostos orgânicos semi-voláteis (SVOCs) de petróleo (hidrocarbonetos policíclicos-aromáticos-HPAs e n-alcanos) nas fases gasosa (FG) e particulada (FP) da atmosfera do Recôncavo Baiano, Bahia Brasil. A coleta foi feita , durante 2 horas, usando-se uma bomba hi-vol, especialmente ad...

Levels and distribution of semi VOC present in petroleum, i.e., PAH and n-alkanes, were determined as gases and particulates in the Reconcavo Baiano area atmosphere, Bahia, Brazil. Samples were collected over 2 hr by a hi-vol pump. Particulates were collected in glass fiver filters and gas samples in polyurethane foam cylinders. Total n-alkanes wer...

Atlantic air masses coming from the E transported by the trade winds (66% of the time) and arriving at the coastline of east Brasil, where the Brazilian GAW station is located (Arembepe, 12°46'S 38°10'W) are transported over an industrial area. Deposition of the chemically enriched air occurs over two river basins running to the All Saints Bay. Two...

According to recent assessments, tropical woodlands contribute about half of all global natural non-methane volatile organic compound (VOC) emissions. Large uncertainties exist especially about fluxes of compounds other than isoprene and monoterpenes. During the Large-Scale Biosphere/Atmosphere Experiment in Amazonia - Cooperative LBA Airborne Regi...

Linear alkylbenzenes(LAB) have been investigated in surficial sediments from the Todos os Santos Bay, the largest on the Brazilian coast. The presence of these compounds in the environment has been related to sewage pollution because they are manufactured for the preparation of surfactants used in detergent formulations. They are usually present as...

A method is described for the continuous monitoring of ethanol in ambient air. The system consists of a scrubber coil for enrichment of the analyte from air in an aqueous solution and a directly connected fluorescence detector. Because of using a reagent solution containing alcohol dehydrogenase (ADH) and nicotinamide adenine dinucleotide (NAD+) fo...

DDT degrades to DDE and the ratio of DDT/DDE can be used as a rough estimate of the period of its application, if the half-life of DDT for the specific environment is known. A cross-sectional survey was conducted in SH summer 1994/95 for several organochloride (OC) residues in 13 intertidal sites of the All Saints Bay, using sediments, crabs and th...

In a tropical coastal area. During 6 months the composition of rain samples collected simultaneously over 24h with an open collector and with an automatic opened collector (KFA - J lich Type) at 500m of the Atlantic coastline of Salvador were compared. All average concentrations were higher for the "total" samples than for the "wet only" samples, e...

In a tropical coastal area. During 6 months the composition of rain samples collected simultaneously over 24h with an open collector and with an automatic opened collector (KFA - J¸lich Type) at 500m of the Atlantic coastline of Salvador were compared. All average concentrations were higher for the "total" samples than for the "wet only" samples, e...

A cross-sectional epidemiological study has investigated lead poisoning among all the 101 children aged 1 to 5 years, living at less then 500 m from a lead smelter which has been operating since 1960 in Santo Amaro da Purificação, State of Bahia, Brazil. Lead poisoning was evaluated by determining the concentrations of zinc protoporphyrin (ZPP) in...

A cross-sectional epidemiologic survey conducted at the beginning of 1992 evaluated the status of lead intoxication among children from 1 to 5 years of age living within 500 meters of a primary lead smelter in the Brazilian city of Santo Amaro, Bahia. A total of 103 children in this age group were initially enrolled in the study; however, 2 were la...

A cross-sectional epidemiologic study performed at the beginning of 1992 evaluated the existence of lead poisoning among 100 children aged 1-5 years who lived within 500 m of a primary lead smeltery in the city of Santo Amaro, Bahia (Brazil). The study population represented all the children in the specified age group. The results were compared wit...

Um estudo epidemiológico de corte transversal, realizado no início de 2992, avaliou a situagáo da intoxica@0 por chumbo em 101 criancas de 1 a 5 anos de idade residentes nurn raio de 500 m de uma fundi@o pimária de chumbo, localizada na ciakde de Santo Amaro, Bahia. Estuda-ram-se todas as criancas dentro dessa faixa etária. Os resultados fóram comp...

The dose-response relationship between erythrocyte protoporphyrin (EP) and blood lead (PbB) was investigated among children with different subgroups of iron status. The data bank from Santo Amaro City, Brazil, was taken to study 490 children aged 1-9 years who lived at less than 900 m from a primary lead smelter. Mean PbB was 58.9 +/- 25.3 microgra...

During a period of 24 years a 30,000 tons/year lead smelter operated in the vicinity of Santo Amaro (30,000 inhabitants). This plant used local galena as ore which contained high levels of cadmium, and no proper air pollution control system existed. About 650 children aged 1–9 years, all of low social and economic standards, lived within 900 m of t...

Concentrations of H2O2 in atmospheric gas and liquid phases were determined for the first time in the tropical Southern Hemisphere. Measurements were carried out in the Salvador area, Bahia, 13°S, 38°W) both at the seaside and 500 m away from it as well as at 270 km inland, in a rural area, during March–April 1988. Gaseous H2O2 was collected by cry...

We have measured ambient levels of carbonyls in three major urban areas of Brazil: Sao Paulo, Rio de Janeiro and Salvador. The most abundant carbonyls were acetaldehyde (up to 63 μg m−3, or 35 ppb) followed by formaldehyde (up to 42 μg m−3, or 34 ppb), and acetone (up to 20 ppb). Levels of 10 other aliphatic and aromatic carbonyls were in the range...

Data on aliphatic and aromatic hydrocarbons in different species of edible bivalves collected in the Todos os Santos Bay (Bahia, Brazil) are reported for the first time along the South West Atlantic coast. The species and collection sites were selected for the identification of suitable regional sentinels and for the assessment of different coastal...

Concentrations of HâOâ in atmospheric gas and liquid phases were determined for the first time in the South Hemisphere. Measurements were taken in the Salvador area, Bahia, 13°S, 38.3°W, both at the seaside and 500m away from it, as well as at 270km inland, during March-April 1988. Gaseous samples were taken by cryogenic technique and rain by wet...

In a cross-sectional study, concentrations of cadmium in hair (CdH) were determined for 263 children aged 1-9 years, living less than 900 m from a lead smelter in Santo Amaro, Brazil. The mean CdH level was significantly higher when individuals with the following characteristics were considered: female, racial group "dark" or "medium", and children...

In the context of a cross-sectional study, concentrations of lead in hair (PbH) were determined by atomic absorption analysis among 263 children aged 1 to 9 years, living less than 900m from a lead smelter in Santo Amaro City, Bahia, Brazil. PbH levels ranged from 20 to 4933 ppm; the median was 349 and the geometric mean was 313 ppm. The mean PbH l...