I hope that this information will be helpful.

http://www.ncbi.nlm.nih.gov/pubmed/20686650

http://www.ncbi.nlm.nih.gov/pubmed/21712165

http://link.springer.com/article/10.1007%2FBF01007612

Ouch... Too much physics in that for a surgeon like me... But thank you very much, I suppose these papers bear the answers to my inquiry... (any chance for you provide me that data "in a nutshell"?)

Possible,

http://www.bloodjournal.org/content/bloodjournal/5/11/1017.full.pdf?sso-checked=true

Ok, I'll read that too. But as a quick heads up, is blood neutral, or charged, electrically, and if so, what's its value? (I don't know even if I asked it properly!)

Ionic content is not a good/sufficient parameter. I give one example: a total Ca++ concentration hides the fact that most is protein-bound/associated and the unbound Ca++ is more relevant than the bound Ca++ for conduction/electrical parameters.

Maybe a better answer can be given if you further describe the purpose, you have in mind.

Several derived measurements at a macroscopic level are frequency dependent, and therefore likely to depend on the properties of endothelium / vesselwalls / cells in the bloodstream.

Blood is not a simple homogenous fluid.

Blood composition varies and can even vary very significantly in certain organs:

I.e. the hematocrite in arterial blood entering the kidney differs a lot from that in blood that has already passed the glomeruli.

Endothelial cells are coated with [mostly] negatively charched polysacharides, that influence the cells passing by and have an indirect effect on the electric behaviour of blood.

A suitable example is found in the lab. Coulter counters use such properties explicitely, but are at the same time very dependent on the properties of the medium used to dilute the blood. So these complex  interactions are not hypothetical but real.

When performing macroscopic measurements [i.e. during impedance plethysmography'] the measurements are influenced by various other factors unrelated to blood composition, such as the presence of edema, or subcutaneous fat. Hence for that purpose AC-techniques are commonly used as wel as a technique using 4 electrodes.

When looking at blood properties in the microvasculature, things become even more complicated. There the surface area of vessel walls is relatively very large compared to the volume of blood. Because of the surface charges present, and because of the many interactions with proteins in the membrane any 'global' or 'generic' parameter becomes next to meaningless.

Chemistry [and electric behaviour] in the large scale fluid phase is a completely different thing than chemistry on and along surfaces, with most molecules at least partially aligned due to electrostatic forces.

There exists no easy answer.

Consider part of the íons partially  'shielded' or 'buffered' or 'bound' in a fluid like blood, so the concept of charge density to the radius of the ion can not be applied in the same manner as in inorganic solutions. Or at the very least, the total concentrations can not be used to derive at the ionic potential.

at least, as a composition, is blood neutral like tap water, or is it actually charged?...

virtually every cell is coated with polysacharides with [usually] negative charches at the outside, so charge carriers are present in addition to simple ions. The pH is about 7.4 meaning that the concentration of free H+ ions is 10^(-7.4) mol/l.

blood and tap water contain ions. so in that sense it is charged.

blood is not isolated from its surroundings, so any net charge will flow away, so charged as in that the total number of negatively charged atoms/molecules exceeds that of th epositively charged ones: NO

Both in tapwater and in blood an equilibrium exists.

Lu, Yi et al. “AC Electrokinetics of Physiological Fluids for Biomedical Applications.” Journal of laboratory automation 20.6 (2015): 611–620. PMC. Web. 7 Mar. 2017.

Dr. Mallick, Thank you for the article. 

hello... can anyone help me to know about the electrical conductivity (bita)  of human blood .. specific value for  'bita'.. please guide me in this.

From Dr. Barshtein's reference (http://www.bloodjournal.org/content/bloodjournal/5/11/1017.full.pdf?sso-checked=true ) the value of blood conductivity ranges from ~10-20 mS/cm (Table 2, pg 6).

nice

Are sickle cells charged?