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ORDIN Nr

ORDIN   Nr. 108 din 16 februarie 2005

privind metodele de prelevare a probelor si de determinare a cantitatilor de azbest in mediu

ACT EMIS DE: MINISTERUL MEDIULUI SI GOSPODARIRII APELOR

ACT PUBLICAT IN: MONITORUL OFICIAL  NR. 217 din 15 martie 2005


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    In temeiul prevederilor Legii protectiei mediului nr. 137/1995, republicata, cu modificarile si completarile ulterioare,
    in conformitate cu prevederile art. 54 pct. 1 lit. d) din Ordonanta de urgenta a Guvernului nr. 78/2000 privind regimul deseurilor, aprobata cu modificari prin Legea nr. 426/2001, si ale art. 10 din Hotararea Guvernului nr. 124/2003 privind prevenirea, reducerea si controlul poluarii mediului cu azbest,
    in baza Hotararii Guvernului nr. 408/2004 privind organizarea si functionarea Ministerului Mediului si Gospodaririi Apelor, cu modificarile si completarile ulterioare,

    ministrul mediului si gospodaririi apelor emite urmatorul ordin:

    Art. 1
    Obiectul prezentului ordin il constituie stabilirea metodelor de prelevare a probelor si de determinare a cantitatilor de azbest in mediu.
    Art. 2
    Se aproba Metoda de analiza de referinta pentru determinarea azbestului din suspensii, prevazuta in anexa nr. 1.
    Art. 3
    Se aproba Metoda de masurare a emisiilor de pulberi cu continut de azbest in atmosfera, prevazuta in anexa nr. 2.
    Art. 4
    Prezentul ordin se publica in Monitorul Oficial al Romaniei, Partea I, si intra in vigoare la data publicarii.
    Art. 5
    Prezentul ordin transpune anexa la Directiva 87/217/CEE.

                Ministrul mediului si gospodaririi apelor,
                              Sulfina Barbu

    ANEXA 1

                              METODA DE ANALIZA
          de referinta pentru determinarea azbestului din suspensii

    Pentru determinarea concentratiei emisiilor de azbest in apa se foloseste metoda gravimetrica.
    Metoda de determinare consta in filtrarea probei (probe neprecipitate) prin membrane cu pori cu dimensiunile de 0,45 mm, urmata de uscare la 105 grade C si cantarire pe balanta analitica. Cantitatea de azbest se exprima in mg/l.
    Probele supuse determinarii trebuie recoltate in asa fel incat sa fie reprezentative pentru evacuarea efluentului apos cu continut de azbest pentru un interval de 24 de ore.
    Determinarea azbestului in apa trebuie efectuata cu o precizie de +/- 5% si o acuratete de +/- 10% .

    ANEXA 2

                              METODA DE MASURARE
          a emisiilor de pulberi cu continut de azbest in atmosfera

    I. Metoda gravimetrica
    Determinarea concentratiei emisiilor de azbest in aer se face prin metoda gravimetrica.
    1. La aplicarea metodei gravimetrice trebuie sa se tina seama de concentratia totala de pulberi de azbest emise prin canalele de evacuare.
    Concentratia azbestului initial se masoara sau se evalueaza. Autoritatea publica locala pentru protectia mediului stabileste frecventa masuratorilor, in concordanta cu caracteristicile instalatiei din care rezulta pulberile, frecventa care initial nu trebuie sa fie mai mare de 6 luni.
    Daca in urma masuratorilor nu se inregistreaza variatii semnificative ale concentratiei pulberilor de azbest, frecventa masuratorilor se poate reduce.
    Cand nu se efectueaza masuratori periodice, valorile limita se aplica pentru emisiile totale de pulberi cu continut de azbest.
    2. Prelevarea probelor
    Prelevarea probelor se realizeaza in fluxul de emisii inainte de orice diluare a acestuia, cu o precizie de +/- 40% si o acuratete de +/- 20% din valoarea limita. Cel putin doua masuratori vor fi efectuate in aceleasi conditii, pentru verificarea conformarii cu valorile limita.
    3. Masuratorile
    Masuratorile se valideaza numai daca prelevarea probelor se face in conditii normale de functionare a instalatiei.
    4. Selectarea punctelor de prelevare
    La selectarea punctelor de prelevare se tine cont, pe cat posibil, ca fluxul de emisii sa fie laminar, evitandu-se turbulenta si obstacolele care o pot genera.
    5. Prelevarea probelor
    Prelevarea probelor se face din conducte prevazute cu fante adecvate si cu platforme corespunzatoare care sa permita realizarea in siguranta a operatiei de prelevare.
    6. Masuratori ce trebuie efectuate inainte de prelevare
    Inainte de inceperea recoltarii probelor se masoara temperatura, presiunea si viteza fluxului de emisii prin conducta, de-a lungul liniei de prelevare. In conditii exceptionale se masoara si concentratia vaporilor de apa astfel incat rezultatele sa poata fi corectate.
    7. Cerinte generale la prelevarea probelor
    Procedura consta in trecerea unui volum de gaz, prelevat din conducta de transport al emisiilor de pulberi cu continut de azbest, printr-un filtru unde cantitatea de azbest este retinuta si apoi cantarita.
    7.1. Inainte de prelevarea probelor se verifica etanseitatea liniei de prelevare pentru a nu exista nici o fisura care poate conduce la aparitia unor erori de masurare.
    Sonda de prelevare se fixeaza cu grija si apoi se porneste pompa. Viteza scurgerilor nu trebuie sa depaseasca 1% din debitul normal de prelevare.
    7.2. Prelevarea normala se realizeaza in conditii izocinetice.
    7.3. Durata de prelevare depinde de tipul instalatiei supuse monitorizarii. Linia de prelevare si durata sunt alese astfel incat sa se obtina o cantitate suficienta de azbest pentru a fi cantarita.
    7.4. Cand filtrul de prelevare nu este situat in imediata apropiere a sondei, este absolut necesar sa se recupereze materialul colectat in sonda.
    7.5. Tipul sondei si numarul punctelor de prelevare se aleg in concordanta cu standardele in vigoare.
    8. Natura filtrului pentru prelevare
    8.1. Filtrul se alege corespunzator tehnicii de analiza utilizate. Pentru metoda gravimetrica se utilizeaza filtre din fibra de sticla cu o eficienta de filtrare de 99% . Ca referinta se considera testul "DOP" care utilizeaza aerosoli cu particule cu diametrul de 0,3 mm.
    9. Cantarirea
    9.1. Se efectueaza pe balanta analitica de inalta precizie.
    9.2. Pentru a se obtine acuratetea solicitata pentru cantarire trebuie sa se conditioneze materialul filtrant inainte si dupa prelevare.
    10. Exprimarea rezultatelor
    Rezultatele obtinute contin, pe langa parametrii masurati (concentratia azbestului, temperatura, presiunea si debitul de aer), si informatii relevante privind localizarea punctelor de prelevare, dimensiunea conductelor, volumele prelevate si metoda de calcul utilizata pentru interpretarea rezultatelor. Rezultatele vor fi exprimate la temperatura si presiune normale (T = 273 grade K, p = 101,3 kPa).

    II. Metoda numararii fibrelor
    Concentratia emisiilor de azbest in aer se poate face si prin metoda numararii fibrelor de azbest, prevazuta in Ordinul ministrului muncii si solidaritatii sociale si al ministrului sanatatii si familiei nr. 508/933/2002 privind aprobarea Normelor generale de protectie a muncii, publicat in Monitorul Oficial al Romaniei, Partea I, nr. 880 din 6 decembrie 2002, si in Ordinul ministrului muncii si protectiei sociale nr. 389/1996 privind aprobarea Normelor specifice de securitate a muncii pentru prelucrarea azbestului, publicat in Monitorul Oficial al Romaniei, Partea I, nr. 222 din 17 septembrie 1996, care transpune prevederile Directivei Consiliului 83/477/CEE (inclusiv modificarea realizata prin Directiva 91/382/CEE) privind protectia sanatatii si securitatii angajatilor fata de riscurile datorate expunerii la azbest.



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