| Summary: | <p class="orbitalabstract">In present work, simples of the food dyes organic synthetic (C<sub>2</sub>OH<sub>12</sub>N<sub>2</sub>Na<sub>2</sub>O<sub>7</sub>S<sub>2</sub>) was submitted to photodegradation with a support of the Fenton and photo-Fenton reactions and measure toxicity with a support of essays germination of the lettuce seeds (<em>Lactuca sativa</em>). The results showed that, using Fenton and photo-Fenton reactions and simples dyes with a concentration of the 2500 ppm, were achieved 100% discoloration in only 30 minutes. The photocatalytic of the uv-vis light, uv-vis and H<sub>2</sub>O<sub>2</sub>, Fenton and photo-Fenton reactions, constant values presented apparent discolored of the, k<sub>ap</sub> = 0.02161 min<sup>-1</sup>, k<sub>ap</sub> = 0.04939 min<sup>-1</sup>, e k<sub>ap</sub> = 0.1244 min<sup>-1</sup>, respectively. The reduction toxicity assays presented a significant reduction of toxicity after analyzing the samples collected in 120 minutes of the photolysis. The toxicity reduction achieved, compared to the control sample, was 17.43% for the growth of the radicle and 32.35% for the growth of the hypocotyl.<strong> </strong></p><p> </p><p>DOI: <a href="http://dx.doi.org/10.17807/orbital.v1i1.717">http://dx.doi.org/10.17807/orbital.v1i1.717</a></p>
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