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(in ppm) in river water of 50 different waters collected in September 2012. Concentration (ppm)


Frequency


20 - 29


1


30 - 39


7


40 - 49


8


50 - 59


11


60 - 69


11


70 - 79


7


80 - 89


3


90 - 99


2



Oct 18th, 2017
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Jul 7th, 2013

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Oct 18th, 2017
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Oct 18th, 2017
Oct 19th, 2017
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