{"id":5944,"date":"2018-05-21T20:50:30","date_gmt":"2018-05-21T18:50:30","guid":{"rendered":"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/?p=5944"},"modified":"2018-05-21T20:50:30","modified_gmt":"2018-05-21T18:50:30","slug":"dia-mundial-de-laigua-al-riu-llobregat","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/mediambient\/dia-mundial-de-laigua-al-riu-llobregat\/","title":{"rendered":"Dia Mundial de l&#8217;Aigua al riu Llobregat"},"content":{"rendered":"<p><a href=\"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6094\" src=\"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1-1024x768.jpg\" alt=\"\" width=\"900\" height=\"675\" srcset=\"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1-1024x768.jpg 1024w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1-300x225.jpg 300w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1-768x576.jpg 768w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1-200x150.jpg 200w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/7aed608c-ce78-447f-bfde-3b783bf99d6d-1.jpg 1600w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a>El passat 20 d&#8217;abril, alguns alumnes del Cicle Formatiu de Qu\u00edmica Ambiental vam realitzar una activitat volunt\u00e0ria al riu Llobregat, com a homenatge al Dia Mundial de l&#8217;Aigua celebrat el 22 de mar\u00e7.<\/p>\n<p>La jornada consistia a realitzar un conjunt de tallers i activitats preparats a la vora del riu Llobregat, destinada a alumnes de 1r i 2n d&#8217;ESO del nostre institut i tamb\u00e9 d&#8217;altres de l&#8217;Hospitalet, fet que va convertir la jornada cient\u00edfica en un dia de lleure i oportunitats per con\u00e8ixer gent nova. L&#8217;activitat va ser organitzada per l&#8217;expert en el Riu Llobregat i antic professor del Cicle Formatiu, Gen\u00eds Pascual, qui va aconseguir coordinar els tallers, assegurar-se&#8217;n que tot el material necessari hi era disponible, i donar vida a aquella festa amb detalls com la m\u00fasica d&#8217;ambient o l&#8217;himne del riu que ens va ensenyar a cantar a tots plegats.<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<p>Els alumnes del Cicle Formatiu ten\u00edem el paper de muntar un laboratori de camp on enseny\u00e9ssim als alumnes m\u00e9s petits com determinar semiquantitativament alguns dels contaminants que arrossega el riu Llobregat al llarg del seu curs, mitjan\u00e7ant una presa de mostra que vam realitzar abans d&#8217;iniciar l&#8217;activitat i una posterior colorimetria espec\u00edfica per a cada contaminant.<\/p>\n<p>Primer, la presa de mostra la van fer dues de les companyes del Cicle Formatiu, utilitzant unes botes de canya alta i un arn\u00e8s de seguretat. L&#8217;objectiu era col\u00b7locar-se el m\u00e9s a prop possible de la part central del riu, perqu\u00e8 la mostra fos representativa, i submergir una ampolla de pl\u00e0stic a favor del corrent del riu per evitar que, a part de l&#8217;aigua a analitzar, entressin s\u00f2lids o altres materials indesitjables. Posteriorment ens vam dividir en parelles perqu\u00e8 cada una enseny\u00e9s als alumnes una colorimetria diferent. Els contaminants del riu que vam analitzar van ser clorurs, amoni, fosfats, nitrats, i tamb\u00e9 les propietats de la duresa de l&#8217;aigua i el color real i aparent. Els nens anaven rotant pels tallers, en els que en 5 minuts podien comprovar com s&#8217;analitza colorim\u00e8tricament un d&#8217;aquests components de l&#8217;aigua mostrejada, i entendre perqu\u00e8 l&#8217;aigua del riu Llobregat est\u00e0 tan contaminada.<\/p>\n<p><a href=\"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6095\" src=\"http:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1-1024x768.jpg\" alt=\"\" width=\"900\" height=\"675\" srcset=\"https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1-1024x768.jpg 1024w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1-300x225.jpg 300w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1-768x576.jpg 768w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1-200x150.jpg 200w, https:\/\/agora.xtec.cat\/ies-merce-rodoreda\/wp-content\/uploads\/usu644\/2018\/05\/c6cf88fe-fe4c-4880-b5c3-4c433365f6b1.jpg 1600w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><\/p>\n<p>Personalment em vaig encarregar, juntament amb una companya, d&#8217;ensenyar com analitzar els clorurs. El proc\u00e9s consistia a afegir dues gotes d&#8217;un primer reactiu, que feia virar la mostra d&#8217;aigua a un color violeta, i posteriorment s&#8217;afegia un altre reactiu que produ\u00efa un viratge a incolor de nou. A continuaci\u00f3 proced\u00edem a fer una valoraci\u00f3 amb un tercer reactiu utilitzant una xeringa, abocant gotes una a una fins a aconseguir un nou viratge a color violeta. En aquest moment, mir\u00e0vem el volum marcat per la xeringa i multiplic\u00e0vem per 1000 per desfer el factor de diluci\u00f3 i obtenir la concentraci\u00f3 en ppm (part per mili\u00f3) de clorurs. Com era un valor elevat, conclo\u00edem que el riu estava contaminat per aquest par\u00e0metre, ja que durant el seu curs passa per les mines de sal de Cardona, on dissol la sal (NaCl) i arrossega una gran concentraci\u00f3 de clorurs.<\/p>\n<p>La jornada de celebraci\u00f3 del Dia Mundial de l&#8217;Aigua va resultar ser una bonica experi\u00e8ncia per compartir i passar una bona estona en contacte amb la natura, concretament amb el riu que afortunadament tenim l&#8217;oportunitat d&#8217;estudiar, el riu Llobregat.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El passat 20 d&#8217;abril, alguns alumnes del Cicle Formatiu de Qu\u00edmica Ambiental vam realitzar una activitat volunt\u00e0ria al riu Llobregat, [&hellip;]<\/p>\n","protected":false},"author":234,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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