摘要
本文探讨了使用不同储存容器(玻璃溶解氧瓶和高密度聚乙烯(HDPE)瓶)、保存时间及计算软件(CO2SYS和PHREEQC)对水体二氧化碳分压p(CO2)和通量F(CO2)测算值的影响.结果表明:溶解氧瓶和HDPE瓶,两者差异不显著(p＞0.05).样品只要经过0.45 μm微孔滤膜过滤、冷藏(4℃)并在24 h内进行测定,保存时间对结果影响不显著(p＞0.05).CO2SYS的p(CO2)计算值约为PHREEQC的30％左右,差异显著(p＜0.05).可能原因是PHREEQC有考虑岩溶作用,而CO2SYS没有.但在研究水质参数(COD、总氮、硝酸盐氮、氨氮、总磷、叶绿素、溶解氧(DO)和碳酸盐矿物饱和指数等)与水体p(CO2)和F(CO2)的关系和影响时,两个软件得出的规律是一致的.
Abstract
This study explores the effects of different storage containers(glass dissolved oxygen bottles and high density polyethylene(HDPE)bottles),storage time,and calculation software programs(CO2SYS and PHREEQC)on the analysis of CO2 partial pressure(p(CO2))and CO2 flux(F(CO2))of water.The results showed that no significant difference(p＞0.05)in the p(CO2)and F(CO2)results was observed between glass dissolved oxygen bottles and HDPE bottles.The storage time showed no significant impact(p＞0.05)on the measurements of p(CO2)and F(CO2),as long as the samples were pass through 0.45 μm microporous filter,kept at(4 ℃),and measured within 24 hours.The calculated p(CO2)values by CO2SYS were approximately only 30％of those by PHREEQC,with a significant difference(p＜0.05).The possible reason could be that PHREEQC considers karstification,while CO2SYS did not.However,in the assessments of the effects of water characteristics(chemical oxygen demand(COD),total nitrogen,nitrate nitrogen,ammonia nitrogen,total phosphorus,total chlorophyll,dissolved oxygen(DO),and carbonate mineral saturation index)on the p(CO2)and F(CO2)of water,the patterns obtained by the two software programs were consistent.
基金项目
广东省环境健康与资源利用重点实验室项目(2020B121201014)
NETL
NSTL
万方数据