求翻译：通常水的纯度是以其电阻率（或电导率）来表征，但对于高纯水来说这是不确切的，应检测纯水中某项杂质的含量来表征。这是因为：第一影响高纯水电阻率的主要因素是PH，而不是PPt级的杂质。大家知道，当量电导入=电导率K×当量体积=K 1000/N,即电导率K=入 N 1000/N或电阻率P=1/K=1000/入N可见，电阻率与当量电导和离子浓度的乘积成反比，当量电导与温度有关，如表一。所以，电阻率与溶液的温度，导电离子种类和浓度有关。有关资料表明：H的当量入最大，OH次之，其他大多数离子的当量电导入为它们的几分之一，温度对当量电导影响为（-1.9～-2.2）%/℃，不含任何杂质的理论纯水，以25℃时的入H和入OH及不同PH时的NH和NOH代入上式得25℃时不同PH时理论纯水电阻率如表二。是什么意思？

Usually its resistivity is the purity of the water (or conductivity) characterized, for high pure water, but this is not true, detection of the content of certain impurities in the water to characterization. This is because: first affect the resistivity of high purity water PH is the main factor, and not PPt level of impurities. As you know, Eve import volume =K 1000/N Kx = conductivity equivalent, that is, electric conductivity resistivity P=1/K=1000/1000/N or K= into n in n, electrical conductivity and resistivity and equivalent product is inversely proportional to the concentration, equivalent conductivity with temperature, such as a table. Therefore, resistivity and temperature of the solution, conductive kinds and concentrations of ions. About information indicates that: h of equivalent into maximum, OH followed, other most ion of equivalent electric import for they of a few minutes one, temperature on equivalent conductivity effect for ( -1.9~-2.2)%/℃, not containing any impurities of theory pure water, to 25 ℃ Shi of into h and into OH and the different PH Shi of NH and NOH generation into Shang type was 25 ℃ Shi different PH Shi theory pure water resistance rate as table II.