limonene-8,9-diol, and monohydroxylated limonene.8,10 About 25-30 percent of an oral dose of d-limonene in humans was found in urine as d-limonene-8,9-diol and its glucuronide; about 7-11 percent was eliminated as perillic acid and its metabolites.6 Safety D-limonene is considered to have fairly low toxicity.
In order to measure the voltage ,voltmeter should be connected in parallel. Voltmeter provides very high resistance . When voltmeter connected in parallel..so no current flowing through it due to very high resistance.. Voltage drop will occur..we get some voltage so its indicates voltage ( as per definition).
Hence a voltmeter must be placed across a circuit and not in it. Physics Willis Eugene Tower. The hydrogen electrode is connected with the negative post of the voltmeter, the oxygen electrode with the positive post. The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.