Anions in wastewaters - Determination of Anions in Natural and Treated Waters - page 527

Iron(III) 25 Carbonate 1000

Nitrite (as N) 50 Calcium 3000

Aluminium 100 Colour According to absorbance

Iron (II) 300 at 4 10nm. Adequately

corrected by re-run

Source: Reproduced with permission from the Royal Society of Chemistry [7]

Table 8.4 Species not indicating interference

Highest concentration
tested/mg L −1

Highest concentration
tested/mg L −1

Species Species

Cadmium 100 Nickel 1000

Lead(II) 100 Nitrate (as N) 1000

Sulphide 100 Orthophosphate

(as P)

1000

1000 Silica (SiO 2 ) Ammonia (as N) 1000

Anionic detergent
(Manoxol

Zinc 1000

OT, sodium lauryl
sulphate)

1000 Chloride 10000

Chromium(III) 1000 Magnesium 10000

Copper(II) 1000 Potassium 10000

Fluoride 1000 Sodium 10000

Manganese 1000 Sulphate 10000

Non-ionic detergent
(Lissapol NX) 1000

Source: Reproduced with permission from the Royal Society of Chemistry [7]

There was no evidence of bias in any of the effluents or raw waters tested except for the
effluent containing substantial petrochemical industry waste. Results of analyses of the
samples used in spiking recovery tests are given in Table 8.2.
The method was tested for interferences by specific factors and Table 8.3 illustrates the
level at which interferences became possibly significant for a recovery of boron of 100
±5% at a 95% confidence level. Table 8.4 shows the highest concentrations tested for
those factors that do not produce interference.