Summary: The castor plant (Ricinus communis L.) is a plant that has dif ferent benefits, such as the production of biodiesel and soil bioremediation. Due to the above, the castor plant’s ability to extract arsenic (As) was evaluated. For this, a randomized block experimental design with four repetitions was carried out. The evaluated treatments consisted of two types of biosolids (oxidation lagoon biosolids (BLO) and activated sludge biosolids (BLA) and four doses of As (0, 25, 50, 100 mg kg-1), under greenhouse conditions. As concentration was determined by inductively coupled plasma mass spectrometry (ICP-MS). From the quantification of As, the translocation factor (TF) and the bioaccumulation factor (FB) were estimated. The total nitrogen (N) content was quantified by the combustion method. Phosphorus (P) was analyzed by colorimetry using the metavanadate method, and the content of potassium (K), calcium (Ca), magnesium (Mg), copper (Cu), manganese (Mn), iron (Fe) and zinc (Zn) was quantified by atomic absorption. For percentage of oil The Soxhlet method was used in the seed. The plant height and the dry weight of biomass did not vary due to the treatment ef fect (P ≤ 0.05). The Translocation Factor (TF) and the Bioconcentration Factor (BCF) registered ranges of 0.20 - 0.63 and 0.28 - 0.75, respectively. The applied doses of As did not af fect the biomass and nutrient absorption in the castor plant, which indicates that this plant species is tolerant to toxicity with productive potential in soils contaminated with this element, in concentrations up to 100 mg kg-1.

Resumen: La higuerilla (Ricinus communis L.) es una planta que tiene diferentes beneficios, como la producción de biodiesel y la biorremediación de suelo. Debido a lo anterior, se evaluó la capacidad de la higuerilla para extraer arsénico (As). Para ello, se realizó un diseño experimental de bloques al azar con cuatro repeticiones. Los tratamientos evaluados consistieron en dos tipos de biosólidos (biosólidos de lagunas de oxidación (BLO) y biosólidos de lodos activados (BLA) y cuatro dosis de As (0, 25, 50, 100 mg kg-1), bajo condiciones de invernadero. La concentración de As se determinó por espectrometría de masas por plasma acoplado inductivamente (ICP-MS). A partir de la cuantificación de As se estimó el factor de translocación (FT) y el factor de bioacumulación (FB). El contenido de nitrógeno (N) total se cuantifico por el método de combustión. El fósforo (P) se analizó por colorimetría por el método de metavanadato, y el contenido de potasio (K), calcio (Ca), magnesio (Mg), cobre (Cu), manganeso (Mn), hierro (Fe) y zinc (Zn) que se cuantificaron por absorción atómica. Para porcentaje de aceite en la semilla se utilizó el método Soxhlet. La altura de planta y el peso seco de biomasa no variaron por efecto de tratamiento (P ≤ 0.05). El Factor de translocación (FT) y el Factor de bioconcentración (FBC) registraron rangos de 0.20 - 0.63 y 0.28 - 0.75, respectivamente. Las dosis aplicadas de As no afectaron la biomasa y absorción de nutrientes en la planta de higuerilla, lo cual indica que esta especie vegetal es tolerante a la toxicidad con potencial productivo en suelos contaminados con este elemento, en concentraciones hasta de 100 mg kg-1.

RESUMO A floresta amazônica desempenha um papel crucial no sistema climático global, atuando como um importante sumidouro de carbono e influenciando os padrões climáticos regionais e globais. Compreender a composição química da água da chuva é essencial para avaliar o impacto das atividades antrópicas, como o desmatamento e emissões industriais, na química atmosférica e hidrologia. Este trabalho objetivou caracterizar a composição química da água da chuva em uma reserva biológica composta por floresta primária na Amazônia central brasileira, distante 60 km de um grande centro urbano. Amostras de água de chuva foram coletadas de março 2008 a março 2010 e analisadas por cromatografia iônica, ICP-MS e TOC-V. Este é o único e mais longo monitoramento pluviométrico realizado nessa reserva. Os resultados mostraram que a água da chuva é rica em carbono orgânico (COT), representando 77% do carbono total. Os íons mais abundantes foram NH4 + e Cl-. Poucos elementos foram detectados, com destaque para Al e Fe. Na estação seca, a maioria das espécies foi enriquecida. A menor quantidade de precipitação, a queima de biomassa e a menor capacidade de remoção de poluentes da atmosfera são os principais motivos desta diferença sazonal. Apenas 7% apresentaram características de chuva ácida (pH < 4,5), com acidez dominada pelo NO3 -. Uma fatoração de matriz positiva indicou contribuição de fontes: crustal (48%), aerossol secundário (26%), biogênico (22%) e emissões industriais (4%). Embora a floresta possua características primárias, a proximidade com o centro urbano indica alguma influência antrópica na composição química das águas de chuva. global globais antrópicas hidrologia brasileira 6 200 201 iônica ICPMS ICP MS TOCV. TOCV TOC V. V TOC-V COT, COT , (COT) 77 total NH Cl. Cl . Cl- detectados Fe seca enriquecida precipitação sazonal 7 pH 4,5, 45 4,5 4 5 4,5) NO - fontes 48%, 48 48% (48%) 26%, 26 26% (26%) 22% 22 (22% 4%. 4% (4%) primárias 20 (COT 4, (48% 2 (26% (22 (4% (48 (26 (2 (4 (

ABSTRACT The Amazon rainforest plays a crucial role in the global climate system, acting as a major carbon sink and influencing regional and global weather patterns. Understanding the chemical composition of rainwater is essential for assessing the impact of anthropogenic activities, such as deforestation and industrial emissions, on atmospheric chemistry and hydrology. This work aimed to characterize the chemical composition of rainwater in a biological reserve of primary forest in the central Brazilian Amazon at 60 km of a large urban center. Rainwater samples were collected from March 2008 to March 2010 and were analyzed by ion chromatography, ICP-MS, and TOC-V. This is the only and longest rainfall monitoring carried out in this reserve. The results showed that the rainwater is rich in organic carbon (TOC), representing 77% of total carbon. The most abundant ions were NH4 + and Cl-. Few elements were detected, with emphasis on Al and Fe. In the dry season, most species were enriched. The lower amount of precipitation, biomass burning and the lower capacity to remove pollutants from the atmosphere are the main reasons for this seasonal difference. Only 7% had characteristics of acid rain (pH < 4.5), with acidity dominated by NO3 -. A positive matrix factorization indicated contribution of sources: crustal (48%), secondary aerosol (26%), biogenic (22%), and industrial emissions (4%). Although the forest has primary characteristics, the proximity to the urban center indicates some anthropogenic influence on the chemical composition of rainwater. system patterns activities hydrology 6 200 201 chromatography ICPMS, ICPMS ICP MS, MS ICP-MS TOCV. TOCV TOC V. V TOC-V TOC, , (TOC) 77 NH Cl. Cl . Cl- detected Fe season enriched precipitation difference 7 pH 4.5, 45 4.5 4 5 4.5) NO - sources 48%, 48 48% (48%) 26%, 26 26% (26%) 22%, 22 22% (22%) 4%. 4% (4%) 20 (TOC 4. (48% 2 (26% (22% (4% (48 (26 (22 (4 (2 (

Abstract The Bacajá domain, southeastern Amazonian craton, comprises Mesoarchaean and Siderian terrains reworked during the Transamazonian cycle. Combined analyses of zircon LA-ICP-MS U-Pb and Lu-Hf with whole-rock Sm-Nd from the northeast portion of this domain made it possible to propose an evolutionary sequence between ca. 2.60 and 2.06 Ga. Gneisses with an igneous protolith age of 2630±15 Ma show negative signatures (ɛHft = -0.3 to -1.7 and ɛNdt = -3.08 to -2.98) and a Mesoarchaean formation (Hf-TDMC and Nd-TDM model ages range from 3.0 to 3.2 Ga). Rhyacian granite genesis lasted about 40 million years (2.10–2.06 Ga) and was divided into two magmatic periods. The first is represented by deformed granitoids with zircons yielding crystallization ages between 2.10 and 2.09 Ga and model ages (Hf-Nd) at about 2.5 Ga. The second event is represented by granitoids with preserved magmatic texture, crystallization ages of 2.06 Ga, and Siderian model ages (Hf-Nd) of around 2.3 Ga. The overall Hf isotopic analyses of this Rhyacian granite genesis exhibit a spread of ɛHft values between 1.8 and -2.9, which show a probably underestimated mantle-derived contribution in this period. craton cycle LAICPMS LA ICP MS UPb U Pb LuHf Lu wholerock whole rock SmNd Sm Nd ca 260 2 60 2.6 206 06 2.0 263015 2630 15 2630±1 0.3 03 0 3 -0. 1.7 17 1 7 -1. 3.08 308 08 -3.0 2.98 298 98 -2.98 HfTDMC TDMC NdTDM TDM 30 3. 32 . 4 2.10–2.06 210206 10 (2.10–2.0 periods 210 2.1 209 09 HfNd (Hf-Nd 25 5 2. texture 23 18 8 1. 2.9, 29 9 -2.9 mantlederived mantle derived period 26 6 20 26301 263 2630± 0. -0 -1 -3. 2.9 2.10–2.0 21020 (2.10–2. 21 -2. - -3 2.10–2. 2102 (2.10–2 -2 2.10–2 (2.10– 2.10– (2.10 (2.1 (2. (2 (