Tutela ambientale del Lago Trasimeno - ARPA Umbria

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1 3 6 A r p a U m b r i a 2 0 1 2 In conclusione viene proposta la distribuzione spaziale dei singoli gruppi (fig.6). La distribuzione evidenzia le seguenti caratteristiche: • il limitato sviluppo areale dei campioni del gruppo C, limitato alla zona sottocosta del settore sud-occidentale del lago; • l’ubicazione del campione relativo al gruppo B per il quale risulta necessario chiarire se si tratti di un campione recante qualche anomalia oppure se sia rappresentativo delle particolari condizioni esistenti nell’area compresa tra S.Feliciano, Isola Polvese e S.Arcangelo (oasi “La Valle”); Tabella 4: Statistiche descrittive dei vari gruppi statistici Statistiche Descrittive Gruppi gruppo A1 gruppo A2 analiti n.validi media mediana min max s.d. n.validi media mediana min max s.d. N tot 7 0,26 0,28 0,16 0,37 0,077 12 0,31 0,3 0,2 0,48 0,087 TOC 7 2,13 2,1 1,9 2,5 0,221 12 1,94 1,9 1,3 2,5 0,378 C tot 7 2,81 2,7 2,3 3,3 0,414 12 3,09 2,85 2,5 4,28 0,597 P tot 7 0,04 0,04 0,02 0,05 0,013 12 0,03 0,03 0,03 0,05 0,007 TOC/Ntot 7 8,53 7,67 6,67 12,5 2,096 12 6,58 6,44 4,52 8,28 1,442 R.S. 4 21,25 21,50 19 23 1,708 12 27,83 26 23 35 4,174 As 7 12,63 12 8,4 17 3,220 12 8,23 8,45 5,1 12 2,21 Cr tot 7 94,43 97 87 101 5,287 12 72,83 73 63 85 7,481 Fe tot 7 35600 38500 28000 42300 6601 12 31858 31500 25000 41500 4922 Mn 7 3848 761 670 12800 5225 12 649,42 629,5 521 835 95,862 Hg 4 0,12 0,11 0,09 0,15 0,025 12 0,13 0,12 0,08 0,25 0,043 Ni 7 63,29 63 56 70 4,231 12 50,08 49 41 62 7,166 Pb 7 26,14 27 21 30 3,078 12 21,25 22 17 25 2,598 Cu 7 27,86 28 24 32 2,734 12 22,92 22,5 20 27 2,353 Se 7 4,2 4,3 2,8 5,3 1,079 12 3,81 3,75 3,1 4,6 0,44 Zn 7 79,71 77 70 96 8,902 12 57,92 57,5 46,00 69 7,242 IPA 4 0 0 0 0 --- 12 0,01 0 0 0,03 0,01 PCB 4 0 0 0 0 --- 12 0 0 0 0 --- gruppo C gruppo B analiti n.validi media mediana min max s.d. n.validi media mediana min max s.d. N tot 3 0,11 --- 0,2 0,48 0,087 1 0,7 --- --- --- --- TOC 3 0,46 --- 1,3 2,5 0,378 1 5,9 --- --- --- --- C tot 3 1,03 --- 2,5 4,28 0,597 1 9,5 --- --- --- --- P tot 3 0,02 --- 0,03 0,05 0,007 1 0,035 --- --- --- --- TOC/Ntot 3 5,22 --- 4,52 8,28 1,442 1 8,4 --- --- --- --- R.S. 3 55,33 --- 23 35 4,174 1 17 --- --- --- --- As 3 4,27 --- 5,1 12 2,21 1 6 --- --- --- --- Cr tot 3 25,67 --- 63 85 7,481 1 36 --- --- --- --- Fe tot 3 12200 --- 25000 41500 4922 1 22000 --- --- --- --- Mn 3 302 --- 521 835 95,862 1 381 --- --- --- --- Hg 3 0,07 --- 0,08 0,25 0,043 1 0,16 --- --- --- --- Ni 3 18,97 --- 41 62 7,166 1 26 --- --- --- --- Pb 3 7,37 --- 17 25 2,598 1 13 --- --- --- --- Cu 3 9,2 --- 20 27 2,353 1 16 --- --- --- --- Se 3 1,73 --- 3,1 4,6 0,44 1 2,8 --- --- --- --- Zn 3 23,67 --- 46,00 69 7,242 1 35 --- --- --- --- IPA 3 0 --- 0 0,03 0,01 1 0 --- --- --- --- PCB 3 0 --- 0 0 --- 1 0,001 --- --- --- ---
3 . S e d i m e n t i 1 3 7 • un contesto generale caratterizzato dall’appartenenza dei campioni al gruppo A2 ed un concentramento dei campioni del gruppo A1 nel settore nord-occidentale del lago. Per affrontare più nel dettaglio la distribuzione dei gruppi è stato necessario utilizzare la distribuzione spaziale degli elementi ritenuti avere il maggior peso nella varianza del sistema ricorrendo ad un’elaborazione geostatistica dei dati. 8.3 Analisi geostatistica Le carte della distribuzione spaziale di metalli, nutrienti e residuo secco sono state realizzate utilizzando l’algoritmo di Fig.6: Distribuzione dei campioni identificati in gruppi
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Libri/Arpa Umbria
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Tutela ambientale del lago Trasimen
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5 Indice Presentazione 13 Svedo Pic
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7 4.1 Introduzione 89 4.2 Evoluzion
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1 1 17.4 Conclusioni e auspici 273
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Presentazione 1 3 Le dinamiche che
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Finito di stampare nel maggio 2012
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Tutela ambientale del Lago Trasimeno - ARPA Umbria

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