International Journal of Analytical Chemistry / 2009 / Article / Tab 10

Research Article

Analysis of Bio-Obtainable Endocrine Disrupting Metals in River Water and Sediment, Sewage Influent/Effluent, Sludge, Leachate, and Concentrated Leachate, in the Irish Midlands Shannon Catchment

Table 10

Concentrations of metals found in sludge (mg/kg) for each treatment type.

MetalSite typeSediment concentration (mg/kg)

(MPC mg/kg)NovDecJanFebMarAprKruskal-Wallis value for versus versus Mean % RSD

Ni 300–400 29052310221022782180375.2201.5
36254700405534089103254.1
263329253208301024801752.1

Mn 243358185658698410.1093.5
32022015074024016421.9
178180123902416152.4

Cd 20–40 1516121520100.05911.3
7813962014.6
15141513173015.2

Zn 2500–4000 118710489529259812001.4840.4
340016251002184564317450.3
8468448881162108128260.4

Co 81089107.0442.3
2313201510107.5
16192437955.6

Pb 750–1200 150300325250375750.1091.3
1501002502751507000.5
3003503253753756752.0

Cr n/a 253296410372473372.0038.2
21335134212681377.8
2533344034864552899.1

Cu 1000–1750 212200155145155703.1643.4
6253733734783310031.7
2752402654353985312.0

*Hg 16–25 0.160.340.42.054*
0.420.360.40
0.881.140.88

Maximum permitted concentration as per EU directive 278/86.
Using Minitab15. This test, applied following evidence of nonnormality of the observed levels, tests for equality of medians of the treatment types ( , , and ), that is, if we conclude that the medians are not the same. Adjustments made for ties as required.
*Only 3 samples from each site were chosen for mercury analysis

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