Turbidity StandardsTurbidity Standards

Reagecon’s turbidity standards for ratio and non-ratio instruments are composed of suspended polymer microspheres.
These turbidity standards remove the handling, stability and accuracy problems associated with traditional Formazin turbidity
standards; (for detailed comparison, see Table 1).

Table 1: Comparison of Reagecon Polymer Microsphere & Formazin Turbidity Standards

Feature Reagecon Polymer Microspheres Formazin          
Toxicity

Non-toxic. No special handling or
disposal requirements

Very toxic, contains a known carcinogen.
Requires special handling and disposal

Particle shape & size

Well defined spherical shape. Mean
diameter is 0.06μm with a distribution
between 0.01 and 0.2μm.

Irregular shape and distribution.
Mean diameter is 3μm with a distribution
between 1 and 20μm.

 Shelf life

Does not deteriorate or settle out.
A long stable shelf life at all concentrations.

Flocculates and deteriorates.
Lower concentrations change value
within days, or hours, after preparation.

 Particle suspension

Particles stay in suspension. Mixing is
discouraged as it entrains air.

Particles settle quickly,
suspension must be continuously mixed.
Mixing induces shearing.

 Traceability

Certified traceable to NIST Reference
Material 1690

Non traceable
 Precision (batch to batch) Mean of SD’s 0±0.00 Mean of SD’s 0.9±0.2

 Inter-instrument

reproducibility

0.5 ±0.0 0.8±0.2
 Stability 0.1 – 4000 NTU (1 year) 4000 NTU (3 months). Need for dilutions
to be prepared daily or weekly
 Accuracy

Highly accurate for Reagecon Polymer
Microspheres

±10% (4000 NTUs) up to ±30% for
dilute working standards.

Turbidity Measurement
Accurate and precise laboratory or online analytical measurement can be influenced by the following 6 key parameters:
• Measuring Instrument • Measuring Accessories • The Sample
• The Operator • Standards and Reference Material • Measuring Environment
The technical validation, comparability, quality control/assurance, proficiency testing and traceability of any analysis require
significant attention to detail of all these parameters. Turbidity measurement is no different in this respect.

The Standard / Reference Material
The nephelometric turbidity meter is designed to be routinely standardised with a known light scattering standard. As with
all analytical standards or reference materials, a turbidity standard should fulfil the following criteria:
• Provide traceability.
• Demonstrate the accuracy of results.
• Calibrate the equipment and methodology.
• Monitor the user performance.
• Validate the test.
• Facilitate comparability i.e. to ensure that when the correct procedures have been followed the same analysis of the
same materials will produce results that agree with each other whenever they are performed.


Standards and Reference materials should be produced and characterised in a technically competent manner, should be
homogenous, stable, certified and have available a known uncertainty of measurement. Presently, there are only two types
of standards recognised and approved by the USEPA, Standard Methods, ASTM and other regulatory agencies, these are
formazin or formazin derived standards and suspended polymer microspheres.

Product Listings for Turbidity Standards

CodeItemUnit
R-CRS-0.0-100
Turbidity Standard Non Ratio 0.0 NTU
View in favourites
100ml
R-CRS-0.0-500
Turbidity Standard Non Ratio 0.0 NTU
View in favourites
500ml
R-CRS-0.1-100
Turbidity Standard Non Ratio 0.1 NTU
View in favourites
100ml
R-CRS-0.1-1000
Turbidity Standard Non Ratio 0.1 NTU
View in favourites
1L
R-CRS-0.1-500
Turbidity Standard Non Ratio 0.1 NTU
View in favourites
500ml
R-CRS-0.1-5000
Turbidity Standard Non Ratio 0.1 NTU
View in favourites
5L
R-CRS-0.2-100
Turbidity Standard Non Ratio 0.2 NTU
View in favourites
100ml
R-CRS-0.2-500
Turbidity Standard Non Ratio 0.2 NTU
View in favourites
500ml
R-CRS-0.4-100
Turbidity Standard 0.4 NTU non ratio
View in favourites
100ml
R-CRS-0.4-500
Turbidity Standard 0.4 NTU non ratio
View in favourites
500ml
R-CRS-0.5-100
Turbidity Standard Non Ratio 0.5 NTU
View in favourites
100ml
R-CRS-0.5-500
Turbidity Standard Non Ratio 0.5 NTU
View in favourites
500ml
R-CRS-1-100
Turbidity Standard Non Ratio 1 NTU
View in favourites
100ml
R-CRS-1-500
Turbidity Standard Non Ratio 1 NTU
View in favourites
500ml
R-CRS-1-5000
Turbidity Standard Non Ratio 1 NTU
View in favourites
5L
R-CRS-1.8-100
Turbidity Standard Non Ratio 1.8NTU (100ml)
View in favourites
100ml
R-CRS-10-100
Turbidity Standard Non Ratio 10 NTU
View in favourites
100ml
R-CRS-10-500
Turbidity Standard Non Ratio 10 NTU
View in favourites
500ml
R-CRS-10-5000
Turbidity Standard Non Ratio 10 NTU
View in favourites
5L
R-CRS-100-1
Turbidity Standard Non Ratio 100NTU (1L)
View in favourites
1L
R-CRS-100-100
Turbidity Standard Non Ratio 100 NTU
View in favourites
100ml
R-CRS-100-500
Turbidity Standard Non Ratio 100 NTU
View in favourites
500ml
R-CRS-100-5000
Turbidity Standard Non Ratio 100NTU (5L)
View in favourites
5L
R-CRS-1000-100
Turbidity Standard Non Ratio 1000NTU (100ml)
View in favourites
100ml
R-CRS-1000-500
Turbidity Standard Non Ratio 1000 NTU (500ml)
View in favourites
500ml
R-CRS-150-100
Turbidity Standard Non Ratio 150NTU
View in favourites
100ml
R-CRS-150-500
Turbidity Standard Non Ratio 150NTU
View in favourites
500ml
R-CRS-2-100
Turbidity Standard Non Ratio 2 NTU
View in favourites
100ml
R-CRS-2-500
Turbidity Standard Non Ratio 2 NTU
View in favourites
500ml
R-CRS-20-100
Turbidity Standard Non Ratio 20 NTU
View in favourites
100ml
R-CRS-20-500
Turbidity Standard Non Ratio 20 NTU
View in favourites
500ml
R-CRS-200-100
Turbidity Standard Non Ratio 200 NTU
View in favourites
100ml
R-CRS-200-500
Turbidity Standard Non Ratio 200 NTU
View in favourites
500ml
R-CRS-4-100
Turbidity Standard 4 NTU non ratio
View in favourites
100ml
R-CRS-4-500
Turbidity Standard 4 NTU non ratio
View in favourites
500ml
R-CRS-40-100
Turbidity Standard Non Ratio 40 NTU
View in favourites
100ml
R-CRS-40-500
Turbidity Standard Non Ratio 40 NTU
View in favourites
500ml
R-CRS-400-100
Turbidity Standard Non Ratio 400 NTU
View in favourites
100ml
R-CRS-400-500
Turbidity Standard Non Ratio 400 NTU
View in favourites
500ml
R-CRS-4000-100
Turbidity Standard Non Ratio 4000 NTU
View in favourites
100ml
R-CRS-4000-500
Turbidity Standard Non Ratio 4000 NTU
View in favourites
500ml
R-CRS-5-100
Turbidity Standard Non Ratio 5 NTU 100ml
View in favourites
100ml
R-CRS-5-120
Turbidity Standard Non Ratio 5 NTU
View in favourites
120ml
R-CRS-5-500
Turbidity Standard Non Ratio 5 NTU
View in favourites
500ml
R-CRS-5-5000
Turbidity Standard Non Ratio 5 NTU
View in favourites
5L
R-CRS-5-60
Turbidity Standard Non Ratio 5 NTU
View in favourites
60ml
R-CRS-50-100
Turbidity Standard Non Ratio 50 NTU
View in favourites
100ml
R-CRS-50-500
Turbidity Standard Non Ratio 50 NTU
View in favourites
500ml
R-CRS-50-5000
Turbidity Standard Non Ratio 50 NTU
View in favourites
5L
R-CRS-500-100
Turbidity Standard Non Ratio 500 NTU
View in favourites
100ml

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