Microelectrode measurements of soft microbial mats in Laguna Pozo Bravo

Oxygen and sulphide profiles covering the upper 5–10 mm of soft microbial mats in Laguna Pozo Bravo were measured in situ in triplicate during both daytime (from 13:00 to 16:00) and nighttime (from 20:00 to 01:00) in January 2019. Clark-type oxygen and amperometric sulphide microsensors with a tip width of <50 µm were employed for these measurements. The microsensors were placed on a multisensor holder with a tip distance of ~0.5 cm for simultaneous measurements, with electricity supplied by a portable generator. Oxygen concentration was adjusted for salinity and temperature, according to specifications (Unisense), and values were determined assuming an atmospheric pressure of 1 bar.

2019年1月，研究人员对波佐布拉沃潟湖（Laguna Pozo Bravo）内柔软微生物席（soft microbial mats）表层5–10 mm处的氧气与硫化物剖面开展了三次原位重复测量，测量时段覆盖日间（13:00至16:00）与夜间（20:00至次日01:00）。本次测量采用尖端宽度小于50 µm的克拉克型（Clark-type）氧气微型传感器与安培型（amperometric）硫化物微型传感器；为实现同步测量，将传感器安装于多传感器支架上，传感器尖端间距约为0.5 cm，供电由便携式发电机提供。依据Unisense的技术规范，针对盐度与温度对氧气浓度进行校正，浓度值以1 bar大气压为基准进行计算。