This study investigated the effect of biochar addition (14% w/w) on concentration nutrient ions present in leachate from a commercial green roof substrate after contact with rainwater. Biochar sample was produced wood sawdust at 450 ˚C via slow pyrolysis. The characterized by physico-chemical and hydraluic prosperties techniques including X-ray fluorescence, Fourier transform infrared spectroscopy, diffraction, Raman differential thermal analysis. physical chemical properties were also...

Some regions of Brazil have particularly high levels mercury (Hg) emissions due to industrial activities, and their fish species may therefore suffer contamination through bioaccumulation. In this paper we assess Hg in the muscle, liver, gills blood two different catfish collected from Cananéia Santos-São Vicente estuaries, São Paulo State, Brazil. Fish most polluted site (Santos-São Vicente) showed higher median concentrations both (Cathorops spixii - liver: 1530 µg Kg-1, muscle: 327 Kg-1...

The rupture of the Córrego do Feijão Dam close to Brumadinho municipality is one recent and most devastating environmental disaster in Brazil. This study aims report results metal determinations toxicity assays mining tailing samples collected 5 days after dam rupture. Concentrations As, Cu Ni site 1 (close dam); concentrations Cu, Zn Pb 2 (Solo Sagrado) Cd Cr three replicates 3 (Mario Campos municipality) were higher than TEL reference value. concentration 1, PEL value, indicating effective...

A material is perfectly homogeneous with respect to a given characteristic, or composition, if there no difference between the values obtained from one part another. Homogeneity usually evaluated using analysis of variance (ANOVA). However, requirement that populations data be processed must have normal distribution and equal variances greatly limits use this statistical tool. more suitable test for assessing homogeneity RMs, known as "sufficient homogeneity", was proposed by Fearn Thompson....

A homogeneity study in the preparation of a fish candidate certified reference material is reported. In present study, was examined by flow injection analysis cold vapour atomic absorption spectrometry technique (FIA-CV-AAS). Total mercury and methylmercury were studied this study. Univariate variance (ANOVA) performed for all analytes. The results evaluated using an F-test, which demonstrated no significant difference between-bottle results. It indicative that homogeneous. provide...

Pectic polysaccharides containing apiose, xylose, and uronic acids are excellent candidates for boron fixation. Duckweeds the fastest-growing angiosperms that can absorb diverse metals contaminants from water have high pectin content in their cell walls. Therefore, these plants be considered (B) accumulators. This work aimed to investigate relationship between B assimilation capacity with apiose wall of Spirodela polyrhiza subjected different boric acid concentrations. Plants were grown 7 10...

Assessment of heavy metal content in biological fluids is essential to determine human and animal health as a result exposure contaminated environments, food, water. WDXRF non-destructive method that involves no chemical treatments. It possible perform fast analysis without producing hazardous waste uses small sample volume (± 50 mL), which useful veterinary usage. Therefore, the aim this work was implement an alternative for minor trace elements blood serum samples dairy cattle (Bos taurus)...

As hortas urbanas trazem benefícios alimentares e sociais, mas os poluentesatmosféricos são nocivos à saúde. Então, surge a questão: alimentos dashortas seguros? Para investigar, neste estudo utilizou-se alfacecrespa, mais consumida em São Paulo bioindicadora de metais tóxicos.A pesquisa ocorreu agosto outubro 2018, horta urbana no telhadode um grande shopping da cidade Paulo, cercado intenso tráfego deveículos. Utilizaram-se dois tratamentos, cultivo céu aberto (T1) cultivoem estufa com...

We provide an uncertainty estimates for homogeneity and stability studies of reference material used in proficiency test determination total mercury fish fresh muscle tissue. Stability was estimated by linear regression ANOVA. The results indicate that the is both homogeneous chemically stable over short term. Total concentration tissue, with expanded uncertainty, 0.294 ± 0.089 μg g−1.

Methylmercury (MeHg) has been determined in fish reference materials by direct mercury analyzer (DMA 80) and FIA-CV-AAS. In order to evaluate accuracy, certified (Fish protein, NRCC - Dorm 4 material, Ipen Dourada 1) were analyzed after extraction separation of species. Good agreement the results have obtained (relative error determination between methods varied from 1.5% 39%). The repeatability 4% 26%.

The rupture of the Córrego do Feijão Dam close to Brumadinho municipality is one recent and most devastating environmental disaster in Brazil. This study aims report results metal determinations toxicity assays mining tailing samples collected 5 days after dam rupture. Concentrations As, Cu Ni site 1 (close dam); concentrations Cu, Zn Pb 2 (Solo Sagrado) Cd Cr three replicates 3 (Mario Campos municipality) were higher than TEL reference value. concentration 1, PEL value, indicating effective...

A proficiency-testing scheme concerning total mercury determination in fish tissue involved 10 laboratories as participants, who used their regular in-house analytical methods, and the assigned value standard deviation proficiency testing program was derived from calibration against certified reference values of CRMs. The majority participants obtained satisfactory Z-scores, that need to revise procedures were singled out. objective these exercises makes a useful contribution towards...

Semi-analytical balance verification intends to assess the performance using graphs that illustrate measurement dispersion, trough time, and demonstrate measurements were performed in a reliable manner. This study presents internal quality control of semi-analytical (GEHAKA BG400) charts. From 2013 2016, 2 weight standards monitored before any operation. work intended evaluate if significant difference or bias presented on weighting procedure over check generated data reliability. also...

IPEN's research reactor, IEA-R1, an open pool type reactor moderated and cooled by light water. High quality water is a key factor in preventing the corrosion of spent fuel stored pool. Leaching radionuclides from corroded cladding may be prevented efficient treatment purification system. However, as safety management policy, IPEN has adopted chemistry control which periodically monitors levels uranium (U) silicon (Si) pool's since IEA-R1 employs U3Si2-Al dispersion fuel. An analytical...

Is the estimated uncertainty under GUM recommendation associated with metal measurement adequately estimated? How to evaluate if really covers all that is analytical procedure? Considering that, many laboratories frequently underestimate or less overestimate uncertainties on its results; this paper presents evaluation of two ICP-OES procedures seven measurements according approach. Horwitz function and proficiency tests scaled standard were used in evaluation. Our data shows most elements...