esslab logo Microlab Technologies is the servicing and liquid handling division of Esslab (Essex Scientific Laboratory Supplies Limited).

New Salt Line Syringes for Trace Metals analysis

ICP-MS trace metal analysis enhanced with Hamilton Salt Line syringes.

Many laboratories conducting metals analysis on environmental or clinical samples use the Hamilton 500 series diluter/dispensers, which have been proven to enhance their analytical efficiency and performance.


Formula used in PC-Volume software

PC-Volume employs a number of formulas to provide you an accurate sampling result. These formulas are recommended and conform with the NCCLS, DIN, and ISO standard.
Mean Volume
To derive the mean volume, PC-Volume uses the following formulas:
1. Average temperature
2. Density of distilled water
3. Density of air
4. Conversion factor
5. Mean weight
6. Mean volume

1. Average Temperature T(°C)

                      T1 +T2
      T =      ------------------
where: T1 = Temperature at the beginning of the test (°C)
           T2 = Temperature at the end of the test (°C)

2. Density of Distilled Water
Density of distilled water as a function of temperature: DW (g/cm3)

                      999099 155.024 * (T15) 5.01145 * (T-15)2
      DW =      ----------------------------------------------------------------
where:  T = Average temperature (°C)

3. Density of Air
Density of air as a function of barometer pressure and temperature: DA (g/cm3)

                      B / 2869
      DA =   ----------------------
                     T + 273.15

where:  T = Mean temperature (°C)
            B = Air pressure (hPa)
            1.33322 hPa = 1.33322 mbar = 1mmHg

4.Conversion factor
Conversion factor. Z (l/mg)

               1-DA / 8 (g/cm3)
       Z=   ----------------------
                     DW - DA

where:           DA = Density of air (g/cm3)
                     DW = Density of water (g/crn3)

5.Mean Weight
Mean weight: MW (mg)

MW =  SA BA (ordinary sampling i.e. dispensing)
MW =  SA + BA (inverse sampling i.e. taking out liquid)
where:    SA = Average of sample weight (mg)
              BA = Average of blank weights (mg; negative value!)

6.Mean Volume
Mean volume: MV (l)

MV =  MW * Z
where: MW = Mean weight (mg)
              Z = Conversion factor (l / mg)