Table 1 Assumed hydrodynamic (Stokes–Einstein) solute radii (rs)21,22,23,24,25,26,27,28 and calculated reflection coefficients (σ) and permeability-surface products (PS) for large pores (LP) and small pores (SP).

From: Transcapillary transport of water, small solutes and proteins during hemodialysis

 

rs [Å]

σLP

σSP

PSLP [mL/s]

PSSP [mL/s]

Sodium (Na+)

1.8

0.00024

0.0072

0.44

200.78

Potassium (K+)

1.3

0.00013

0.0038

0.61

291.71

Chloride (Cl−)

1.2

0.00011

0.0032

0.67

319.05

Bicarbonate (HCO3−)

2.2

0.00036

0.0107

0.36

157.97

Other cations (C2+)

3.1

0.00071

0.0209

0.25

102.44

Urea (U)

1.8

0.00024

0.0072

0.44

200.78

Creatinine (Cr)

2.6

0.00050

0.0148

0.30

128.46

Albumin (Alb)

35.5

0.08260

0.9442

0.012

0.0082

Globulins (Glob)

69.9a

0.27320

1.0000

0.003

0.0000

  1. For ultrasmall pores σUP = 1 and PSUP = 0 for all solutes.
  2. aAverage hydrodynamic radius of non-albumin plasma proteins calculated from data on individual globulin fractions and fibrinogen28,29,30.
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