Metalyser
®
Soils HM4000
Instruction Manual v3.0
Altering deposition times
The standard default deposition time of 60 seconds is suitable for all analysis down to
5mg/kg for most elements, 10mg/kg for arsenic. To increase accuracy for the lower
levels an increased deposition time is recommended. If the user expects the analysis to
be higher, then a shorter deposition time should be used. This can be adjusted when
prompted to choose a deposition time at the beginning of the test methods.
30, 60 or 120 seconds can be selected by moving the joystick to the right and to
the left
on this screen and then pushing the centre of the joystick to accept it.
Deposition time Concentration range
30 seconds 50mg/kg to 500mg/kg
60 seconds 10mg/kg to 50mg/kg
120 seconds <10mg/kg
Suggested ranges for choosing deposition times
The instrument has been designed to have a maximum reading of 500mg/kg. Should the
user wish to measure higher than this they will need to dilute the sample. For example, if
the user wishes to measure 600mg/kg dilute the sample by half and then multiply the
result by 2.
Always dilute with water that will not contribute to the heavy metals being tested.
Deionised water is ideal.
Blank subtraction
Blank subtraction is recommended to be used for all of the analyses and is the default
setting. It is particularly important for the analysis of Hg and As.
