Abstract
Objective: The evaluate exposure to cyanide inhalation via from to Tacacá traders in the municipality of Belém, Pará state. Methods: The cross-sectional and analytical observational study was conducted in 2019 on a biological sample (blood) from Tacacá traders and control group. The cyanide free (HCN) and Metahemoglobin (MeHb) were measured by spectrophotometry Uv (Ultraviolet). Data stood evaluated using descriptive statistics and tests of analysis of variance and Pearson correlation, adopting p≤0.05. The study was approved the Research Ethics Committee. Results: Mean HCN free concentration of exposed population samples remained 1.32 mg / L and unexposed 1.29 mg / L is classified as moderate exposure, p value = 0.0068. MeHb dosage values was 2.7% for the exposed group and 2.6% for the unexposed group, meeting the parameters established. Conclusion: The correlation among MeHb and HCN in the exposed group, although not statistical significance. It was observed that the higher cyanide exposure level and higher MeHb levels.