page_title: Nessler cylinder
hierarchical_section_title: Nessler cylinder
caption_attribution_description: English: Nessler cylinders. Iron assay. Polski: Cylindry Nesslera. Oznaczanie żelaza.
context_page_description: Nessler cylinders are laboratory tubes with a fixed volume, made of glass with optically plane bottom. On the walls there are marks of the nominal stroke volume and possibly one half-way mark
  Nessler cylinders are used for colorimetric analysis, such as APHA color. The color of the substance contained in a Nessler cylinder is visually compared with the model. The tubes are often used to carry out a series of calibration solutions of increasing concentrations, which functions as a comparative scale. To minimize differences in the subjective impression of the color of the solution of the substance to be analyzed, cylinders of a series should have the same characteristics - height, diameter and thickness of glass. Basically there are four types of used cylinders:
  high with a capacity of 50 ml
  low with a capacity of 50 ml
  high with a capacity of 100 ml
  low capacity of 100 ml
  These parameters, however, can vary significantly between two cylinders.
  Hehnera cylinders differ in that they are scaled to full height.
  Due to the spread of automated spectrophotometers, colorimetric assay methods using Nessler cylinders and visual assessment are used very rarely.
context_section_description: Nessler cylinders (also named color comparison cylinders or color comparing cylinders) are laboratory tubes with a fixed volume, made of glass with optically plane bottom. On the walls there are marks of the nominal stroke volume (usually 100 ml) and possibly one half-way mark (then usually 50 ml)
  Nessler cylinders are used for colorimetric analysis, such as APHA color. The color of the substance contained in a Nessler cylinder is visually compared with the model. The tubes are often used to carry out a series of calibration solutions of increasing concentrations, which functions as a comparative scale. To minimize differences in the subjective impression of the color of the solution of the substance to be analyzed, cylinders of a series should have the same characteristics - height, diameter and thickness of glass. Basically there are four types of used cylinders:
  high with a capacity of 50 ml (about 300 mm in height, approximately 21 mm in diameter)
  low with a capacity of 50 ml (about 175 mm in height, approximately 25 mm in diameter)
  high with a capacity of 100 ml (about 375 mm in height, approximately 24 mm in diameter)
  low capacity of 100 ml (about 210 mm in height, approximately 34 mm in diameter)
  These parameters (except volume), however, can vary significantly between two cylinders.
  Hehnera cylinders differ in that they are scaled to full height. 
  Due to the spread of automated spectrophotometers, colorimetric assay methods using Nessler cylinders and visual assessment are used very rarely. Nessler cylinders are still used, however, as reaction vessels, in the same way as test tubes.
caption: Determination of iron by a colorimetric method, top view
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