In the present study, Fe, Cu, Cr, Cd, Pb, Ni, and Al concentrations in Caiman latirostris and Testudines blood from the Tapacurá reservoir, Pernambuco, Brazil, were investigated. Blood was acid digested with HNO₃, and metals were determined by ICP-OES and FAAS. Lead showed concentrations below the established limit of detection. Eighty animals were evaluated, forty from each group. The levels of all elements were statistically significant when compared between the two studied taxa (p < 0.05). In caimans, significant differences between young and adults were observed for chromium (p = 0.0539) and aluminum (p = 0.0515). Testudines showed no statistically significant differences for the variable age structure. Gender did not influence metal concentrations detected in the present study for either group. Differences between species of testudines were significant for Fe between Mesoclemmys tuberculata vs Phrynops geoffroanus (p = 0.0932) and Kinosternon scorpioides vs Phrynops geoffroanus (p = 0.063). The inter-elementary correlations showed statistically significant differences between the elements Cr vs Al (R² = 0.52), Cr vs Cd (0.43), Cd vs Cu (R² = 0.41), Ni vs Cu (R² = 0.31), Ni vs Cr (R² = 0.30), Al vs Cd (R² = 0.27), and Cd vs Fe (R² = 0.26). It is concluded that blood is an excellent predictor of metals in crocodilians and testudines in the Tapacurá reservoir, with statistically significant differences when correlated to concentrations such as size and species studied. In addition, it evidenced data that prove the exposure of these animals to metals, with strong inter-elementary correlations and opening doors for future studies that seek to understand possible biological effects caused in the studied taxa.

在本研究中，调查了来自巴西伯南布哥塔帕库拉水库的凯门鳄和睾丸中血液中的铁，铜，铬，镉，铅，镍和铝的浓度。用HNO ₃酸消化血液，并通过ICP-OES和FAAS测定金属。铅的浓度低于确定的检测极限。评价了80只动物，每组40只。在两个研究的分类单元之间进行比较时，所有元素的水平均具有统计学意义（p  <0.05）。在凯门鳄中，铬和铬（p  = 0.0539）和铝（p = 0.0515）。睾丸显示没有可变年龄结构的统计学显着差异。性别不影响在本研究中检测到的任何一组的金属浓度。龟鳖的物种之间差异为铁之间显著tuberculata中龟属VS花面蟾头龟（p  = 0.0932）和动胸龟属scorpioides VS花面蟾头龟（p  = 0.063）。元素间的相关性表明元素Cr与Al（R ²  = 0.52），Cr与Cd（0.43），Cd与Cu（R ²  = 0.41），Ni与Cu（R ² = 0.31），Ni对Cr（R ²  = 0.30），Al对Cd（R ²  = 0.27）和Cd对Fe（R ²  = 0.26）。结论是，血液是Tapacurá水库中鳄鱼和睾丸中金属的极佳预测指标，与所研究的大小和物种等浓度相关时，具有统计学上的显着差异。此外，有证据表明这些动物暴露于金属中，具有很强的元素间相关性，并为以后的研究敞开了大门，以期进一步了解在研究的类群中可能产生的生物学效应。