Nitrites+Nitrates

NO2-/NO3-

Applications

  • Drinking water
  • Process optimisation of wastewater treatment plants
  • Industrial and municipal wastewater
  • Mineral water monitoring
  • Surface water
Nitrites+Nitrates

Description

Multiparameter online analyzer for the determination of nitrites and nitrates in water.
The instrument is ideal for potable water or suface water analysis and with the addition of a dilution module is also capable of the determination of nitrites and nitrates in complex matrices such as urban and industrial wastewaters.

Method

In acidic media, nitrites react with sulfanilamide and N-(1-naphthyl)-ethylene diammonium dichloride, forming a purple colored dye. The absorbance intensity is proportional to the nitrites concentration in the sample and is determined at 525 nm.

Features

Measured parameter NO2-

Range

(Ø 26 mm) 5 - 500 ppb N-NO2 (1.6 ppm NO2)
(Ø 16 mm) 0.02 - 1 ppm N-NO2 / (3.2 ppm NO2)
(with dilution) 40 ppm N-NO2 / 125 ppm NO2

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 5 ppb / ± 5%, (0-150 ppb)
(Ø 16 mm) ± 10 ppb (150-600 ppb), ± 20 ppb / ± 5% (≥ 600 ppb)
Limit of detection 5 ppb
Wavelength 525 nm
Demineralized water Not required
Number of reagents 2
Min. analysis time 7 minutes
Default analysis time 15 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 1.4 L
(Ø 16 mm) 1 L

Reagents and standards

Both hydrazine and copper catalyst reagents are used to reduce Nitrate to Nitrite in a basic medium inside a heated reaction cell. A sulfanilamide and N-(1-naphthyl)-ethylene diammonium dichloride reagent is added to react with the Nitrite to form a purple colored compound. The absorbance intensity is proportional to the Nitrite concentration in the sample and is measured at 525 nm

Features

Measured parameter NO3-

Range

(Ø 26 mm) 2 - 400 ppb N-NO3 (1.28 ppm NO3)
(Ø 16 mm) 4 - 650 ppb N-NO3 (2.08 ppm NO3)
(with dilution) 25 ppm N-NO3 (80 ppm NO3)

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 2 ppb / ± 5%
(Ø 16 mm) ± 5 ppb / ± 5%
Limit of detection 2 ppb
Wavelength 525 nm
Demineralized water Not required
Termoregulation 37 °C
Number of reagents 3
Min. analysis time 11 minutes
Default analysis time 20 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 5.8 L
(Ø 16 mm) 4.3 L

Reagents and standards

Technical Specifications

Model 3S-CL
Sampling Mode Batch, with freely settable frequency.
Sample Pressure: Atmospheric
Temperature: 5 ‐ 45°C (41 ‐ 113°F)
Flow Rate: 80 to 500 mL/min
Connection: 6 mm (¼-in.)
Drain Pressure-free drain
Connection: 12 mm (½-in.)
Input Streams 2
Material Epoxy-coated stainless steel AISI 304
Dimensions (H x W x D) 604 x 380 x 210 mm (23.6 x 14.8 x 8.2 in)
Weight 20 kg (44 lbs)
Power Supply Input Voltage: 115 VAC,230 VAC,24 VDC
Power consumption: max. 80 W
Output signals 2 x 4-20 mA analog outputs
Modbus via RS485,Ethernet
Alarms 2 SPDT programmable voltage-free relays
Digital Input None, Online, Start Extra, Skip Idle, Emergency Stop
Ambient Temperature 5 - 45 °C (41 - 113 °F)
Ambient Humidity 10 - 90 % RH (non-condensing)
Protection Grade IP54 (indoor only, outdoor use possible with external cabinet, not included)

Documentation

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