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Modelo de laudo para fis de PPRA
Autor | Tuffi Messias Saliba |
Ocupação do Autor | Engenheiro Mecânico. Engenheiro de Segurança do Trabalho. Advogado. Mestre em Meio Ambiente. Ex-professor dos cursos de Pós-Graduação de Engenharia de Segurança e Medicina do Trabalho. Diretor Técnico da ASTEC ? Assessoria e Consultoria em Segurança e Higiene do Trabalho Ltda |
Páginas | 139-140 |
Page 139
Foram realizadas amostragens instantâneas de ácido nítrico junto ao tanque de decapagem, utilizando-se o detector MultigásDragerLubeca, tipo 21/31, equipado com os tubos colorimétricos especíicos do mesmo fabricante. As leituras foram tomadas ao nível respiratório do trabalhador, sendo o intervalo delas de, no mínimo, 20 (vinte) minutos e junto ao tanque (fonte).
A) Amostragens contínuas
As amostragens contínuas de ácido nítrico foram realizadas da seguinte forma: o ar ambiente foi aspirado, por meio do amostrador gravimétrico individual, para um tubo de sílica gel de 400/200 mg. Esse tubo foi analisado em laboratório especializado por meio de cromatograia líquida.
As vazões de coleta, o tempo de amostragem, as análises químicas das amostras, entre outros procedimentos, foram realizados de acordo com os métodos analíticos do NIOSH.
Os dados obtidos nas avaliações e as observações necessárias estão nas planilhas que seguem:
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Page 140
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Observa-se pelos quadros anteriores que as concentrações de ácido nítrico nos locais coletados foram bem inferiores aos limites de tolerância recomendados pela ACGIH — American Conference of Governmental Industrial Hygienists, devidamente corrigida para a jornada de trabalho brasileira, ou seja, 8 horas por dia e 44 horas semanais.
Entretanto, veriicou-se, por meio de coleta realizada dentro do tanque (ponto de emanação de vapores), a concentração de 0,50 ppm de ácido nítrico. Constataram-se, também, sinais de corrosão em equipamentos...
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