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The assay features excellent dynamic range (1 840 μmol L−1) and high selectivity, and its limit of detection (0.39 μmol L−1) is also well below the guideline values for drinking water recommended by WHO and U.S. EPA.
Twenty-two supplies (17.6%) exceeded one or more of the maximum acceptable values (MAV) or maximum guideline values for chemical determinands of the New Zealand Drinking Water Standards (NZDWS) and 70 (56.0%) supplies exceeded the microbiological criteria of <1 FC/100 mL.
Guideline values for inorganic, organic, and various general chemistry parameters were entered for each reuse.
Omani and WHO standards also do not set guideline values for biochemical oxygen demand (BOD5).
Results of the data comparison indicated if input values met or exceeded the guideline values for each reuse purpose.
None of dug well and borewell samples complied with the WHO guideline values for coliforms (Table 1), and hence, water from these wells requires treatment before human consumption.
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The content of Mn2+ ions in the purified waste water was measured to be lower than the guideline value for drinking water.
The annual mean number of days per year when summer MDA8 exceeds 100 μg/m3 (equivalent to 50 ppbv), which is a target air quality guideline value for the World Health Organization, is higher both for 2C and for 3C than for the HISTORICAL simulation in South-eastern Europe (see Fig. 3a, c).
The WHO guideline value for fluoride is 1.5 mg/l.
Guideline value for lead is 0.01 mg/l (WHO 2011).
However, there is no health-based guideline value for SO4 2− in drinking water (WHO 2004).
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