杀菌剂聚六亚甲基单胍盐酸盐与戊二醛的垢层渗透行为

Scale-penetration Behavior of Bactericides Polyhexamethylene Monoguanidine Hydrochloride and Glutaraldehyde

陆原

LU Yuan

为分析杀菌剂在采出液环境中于垢层存在条件下的渗透性能及对应的渗透机理，以聚六亚甲基单胍盐酸 盐（简称单胍）与戊二醛为代表，在现场垢层条件下研究两种药剂在水中的渗透性能。通过氮气吸附-脱附法表 征垢样的孔径分布，并通过动态光散射方法分析垢层在3.5% NaCl 溶液中的截面荷电情况。分别在506.7 nm与 232.2 nm处建立单胍和戊二醛在3.5% NaCl溶液中的标准曲线。利用自建渗透装置和吸光度-浓度标准曲线，通 过紫外-可见分光光度计监测单胍与戊二醛在不同渗透时间下的渗透行为。结果表明，现场两种垢样主要由碳 酸钙与硫酸钡组成，平均孔径分别为0.43、0.27 μm；其Zeta 电位均随溶液pH值的增加呈现由正变负的趋势，等电 点分别为4.14 与4.56。两种垢样浸入NaCl 溶液后，界面呈负电性，Zeta 电位分别为-6.56、-5.14 mV。在25 ℃ 下，历经15 d 的渗透监测，单胍呈现先慢后快的渗透行为，最高渗透比例为17.70%；戊二醛则表现出先快后慢的 渗透行为，最高渗透比例为38.75%。垢样孔径直接影响杀菌剂的渗透总量，但不改变其渗透规律。与垢层间的 静电作用导致单胍的早期慢渗透；而物理筛分效应决定戊二醛的渗透量。研究结果为现场杀菌剂的筛选及其与 其他药剂的协同配伍提供借鉴。

In order to compare the scale penetrability and penetration mechanism of different bactericides，a simulated penetration experiment was conducted under the scale layer from the field，employing polyhexamethylene monoguanidine hydrochloride （PHMH） and glutaraldehyde as prototypes. The pore size distribution of scale samples was characterized by nitrogen adsorption-desorption method. Meanwhile，the charging property of scale layers in 3.5% NaCl solution was determined by dynamic light scattering technique. Standard curves for PHMH and glutaraldehyde in 3.5% NaCl solution were established at 506.7 nm and 232.2 nm，respectively. With the aid of self-made device and standard curves，the penetrations of PHMH and glutaraldehyde with time were monitored by ultraviolet spectrophotometer. The results showed that two scale samples on site were mainly composed of calcium carbonate and barium sulfate with an average pore size of 0.43 and 0.27 μm，respectively. The Zeta potentials showed a trend from positive to negative as the pH value of the solution increased. The corresponding isoelectric points were 4.14 and 4.56， respectively. After immersing two scale samples in NaCl solution，the interface showed negative charge with Zeta potential of -6.56 mV and -5.14 mV，respectively. After 15 days of penetration monitoring，PHMH showed a slow penetration behavior first and then fast with 17.70% the highest permeability，while glutaraldehyde showed a fast penetration behavior first and then slow with 38.75% the highest permeability. The pore size of scale sample directly affected the total diffused amount of bactericide，but did not change its diffusion pattern. Electrostatic interaction with the scale layer resulted in the early slow penetration of PHMH，while physical screening effect determined the final penetration amount of glutaraldehyde. This work provided guidance for the screening of on-site bactericide and the synergistic compatibility with other agents.

10.19346/j.cnki.1000-4092.2023.04.022