ASTM D6855-10
Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
- Standard No.
- ASTM D6855-10
- Release Date
- 2010
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D6855-12
- Latest
- ASTM D6855-17(2023)
- Scope
Turbidity is undesirable in drinking water, plant effluent waters, water for food and beverage processing, and for a large number of other water-dependent manufacturing processes. Removal is often accomplished by coagulation, settling, and filtration. Measurement of turbidity provides a rapid means of process control for when, how, and to what extent the water must be treated to meet specifications.
This test method is suitable to turbidity such as that found in drinking water, process water, and high purity industrial water.
When reporting the measured result, appropriate units should also be reported. The units are reflective of the technology used to generate the result, and if necessary, provide more adequate comparison to historical data sets.
Table 1 describes technologies and reporting results (see also Refs (1),(2),(3)). Those technologies listed are appropriate for the range of measurement prescribed in this method. Others may come available in the future. Fig. X5.1 provides a flow chart to aid in selection of the appropriate technology for low-level static turbidity applications.
If a design that falls outside of the criteria listed in Table 1 is used, the turbidity should be reported in turbidity units (TU) with a subscripted wavelength value to characterize the light source that was used.
TABLE 1 Applicable Technologies Available for Performing Static Turbidity Measurements Below 5 NTU
1.1 This test method covers the static determination of turbidity in water (see 4.1).
1.2 This test method is applicable to the measurement of turbidities under 5.0 nephelometric turbidity units (NTU).
1.3 This test method was tested on municipal drinking water, ultra-pure water and low turbidity samples. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.4 This test method uses calibration standards are defined in NTU values, but other assigned turbidity units are assumed to be equivalent.
1.5 This test method assigns traceable reporting units to the type of respective technology that was used to perform the measurement. Units are numerically equivalent with respect to the calibration standard. For example, a 1.0 NTU formazin standard is also equal to a 1.0 FNU standard, a 1.0 FNRU standard and so forth.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Refer to the MSDSs for all chemicals used in this procedure.
ASTM D6855-10 Referenced Document
- ASTM D1129 Standard Terminology Relating to Water
- ASTM D1192 Standard Guide for Equipment for Sampling Water and Steam in Closed Conduits
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
- ASTM D3370 Standard Practices for Sampling Water from Closed Conduits
- ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- ISO 7027 Water quality - Determination of turbidity
ASTM D6855-10 history
- 2023 ASTM D6855-17(2023) Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
- 2017 ASTM D6855-17 Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
- 2012 ASTM D6855-12 Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
- 2010 ASTM D6855-10 Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
- 2003 ASTM D6855-03 Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
