Avaliação De Metais Tóxicos De Alfaces Cultivadas Em Horta Urbana Na Cidade De São Paulo, São Paulo

Abstract

As hortas urbanas trazem benefícios alimentares e sociais, mas os poluentesatmosféricos são nocivos à saúde. Então, surge a questão: os alimentos dashortas urbanas são seguros? Para investigar, neste estudo utilizou-se a alfacecrespa, a mais consumida em São Paulo e bioindicadora de metais tóxicos.A pesquisa ocorreu de agosto a outubro de 2018, em horta urbana no telhadode um grande shopping da cidade de São Paulo, cercado de intenso tráfego deveículos. Utilizaram-se dois tratamentos, cultivo a céu aberto (T1) e cultivoem estufa com controle de ar (T2), com nove repetições cada. Após 60 dias,quantificaram-se as concentrações médias, nas amostras, dos elementosarsênio (As), cádmio (Cd), cromo (Cr), chumbo (Pb) e zinco (Zn), que nãoultrapassaram os limites máximos preconizados pela Agência Nacional deVigilância Sanitária (ANVISA). Concluiu-se que as alfaces não oferecem riscosà saúde humana, e o tratamento T2 reduziu o teor de Zn na alface (p<0,05).

Essential and non-essential elements in lettuce produced on a rooftop urban garden in São Paulo metropolitan region (Brazil) and assessment of human health risks

“…The elemental concentrations in lettuce samples were determined by a relative method of Instrumental Neutron Activation Analysis (INAA). INAA, a sensitive, nondestructive, and multi-element technique, has been frequently used to evaluate inorganic contents in different types of matrices, nd applications in the areas of environment, mineralogy, agriculture, health, and archeology (Bortoletto et al 2019;Silva et al 2022).…”

“…These are required in small quantities, but in excess, they can cause toxic effects (Sharma et Some studies have raised the concern of urban environmental pollution, as for food safety. A recent study in Brazil was conducted in an urban garden on the roof of a large shopping mall in the city of São Paulo, surrounded by heavy vehicular tra c and the mean concentrations of As, Cd, Cr, Pb and Zn in the samples were quanti ed and it was concluded that lettuces grown in an urban garden presented no risk to human health (Bortoletto et al 2019). In China, researchers evaluated hydroponically grown vegetables in a rooftop screen house and the results showed that none of the roof hydroponic vegetables exceeded the maximum residue limit for lead, arsenic, cadmium, chromium, mercury, or nitrate (Liu et al 2016).…”