风向对北京市重污染日PM_(2.5)浓度分布影响研究

对2013年北京市58 d重污染日PM_(2.5)浓度水平进行了分析,并用克里格插值法统计了重污染期间不同风向PM_(2.5)不同浓度区间的国土面积。结果显示2013年北京市重污染日主要集中在冬季,占到全年天数的15.9%,且重污染日PM_(2.5)平均浓度为218μg/m3;重污染日PM_(2.5)空间分布较为均匀且统计的平均浓度在150μg/m3以上的国土面积约占总面积的82%;重污染期间重度污染(150μg/m3)以上面积占比分别为南风(87%)、东风(81%)、西风(70%)、北风(66%);重污染日不同风向下ρ(NO_3~-)、ρ(NH_4~+)、ρ(SO_4~(2-))之和约占ρ(PM~(2.5))的60%~65%,且各组分浓度相差不大。     

2000~2014年北京市SO2时空分布及一次污染过程分析

根据2000~2014年北京市SO2监测数据,系统分析了SO2时空分布特征并采用数值模式(CAMx)模拟分析了一次重污染过程中北京市SO2来源.结果表明,2014年与2000年相比北京市SO2年均浓度累计约降低69%,SO2年均浓度的变化率为-3.5μg·(m3·a)-1;北京市SO2的月均浓度呈U型分布,季节分布上整体呈现出冬季春季秋季夏季的特征,采暖季SO2浓度明显高于非采暖季;空间分布上北部及西部山区SO2浓度水平明显低于中心城区及西南、东南部地区,受减排措施影响较大的石景山、东四、通州监测点的SO2浓度降低明显;在2014年1月14~18日一次重污染过程中北京SO2存在明显的区域输送,PAST源示踪技术初步计算显示外来源对北京SO2浓度的贡献率为83%,其中北京周边高架点源电厂贡献占21%,北京4家主要燃煤电厂对全市SO2浓度贡献率约为3.5%.     

唐山市2017年采暖期不同污染等级PM_(2.5)化学组分特征对比与来源分析

为深入了解唐山市采暖期PM_(2.5)污染成因与来源,采用在线监测设备于2017年12月1日—2018年1月28日连续监测了唐山市PM_(2.5)及其水溶性离子和碳质组分(OC、EC)的质量浓度变化,并结合部分常规气体污染物及气象数据进行对比分析.结果表明:①相对湿度的增加和风速的降低促进了污染的发展.②清洁、轻中度污染和重污染时,SOR (硫氧化率)分别为0. 05、0. 08、0. 20,NOR (氮氧化率)分别为0. 05、0. 12、0. 26,随着污染的加重,SO_2、NOx向PM_(2.5)中SO_4~(2-)、NO3-的二次转化现象更加明显.③清洁时,ρ(OC)、ρ(EC)、ρ(SO_4~(2-))和ρ(Cl-)占PM_(2.5)化学组分(水溶性离子、碳质组分)质量浓度总和的68%,主要污染源为燃煤;清洁、轻中度污染和重污染时,ρ(NO_2)/ρ(SO_2)分别为0. 96、1. 14、1. 44,ρ(NO3-)/ρ(SO_4~(2-))分别为0. 94、1. 57和1. 75;重污染时,ρ(SO_4~(2-))、ρ(NO3-)、ρ(NH_4~+)三者之和占PM_(2.5)化学组分质量浓度总和的61%,二次污染物成为主要污染源.④观测期,唐山市轻中度污染和重污染时,受经北京市、天津市等唐山市西部地区方向气团影响频率分别为61%、63%,受该方向气团影响时,ρ(NO_2)/ρ(SO_2)、ρ(NO3-)/ρ(SO_4~(2-))明显增大.研究显示,相较于燃煤排放物在大气污染物中的占比变化,随着污染的加重,工业工艺和机动车尾气排放产生的污染物占比明显增大,区域传输对大气污染影响不可忽略,政府有必要开展区域联防联控、停产限产和限行限号的措施.     

APEC前后北京SO2垂直分布特征及其对二次硫酸盐生成的影响

SO_2是北京大气中重要的污染气体.为探讨亚太经合组织(APEC)峰会前后北京大气SO_2的垂直分布及其对二次硫酸盐(SO_4~(2-))生成的影响,我们于2014年10月21日至11月30日在地面和北京325 m气象塔260 m高度处同步开展了气体SO_2和亚微米颗粒物中硫酸盐(SO_4~(2-))实时连续在线观测.结果显示,采暖前,北京地面SO_2浓度较低,但高层由于显著受到区域输送的影响浓度较高,两层污染物变化趋势也存在明显差异.采暖后,即APEC后,受本地供暖排放影响,SO_2和SO_4~(2-)浓度显著增加,两层的总体差异也相应减小,变化趋势也更为一致.湿度对SO_2的液相转化起关键作用.我们发现近地面SO_2的转化率(SOR)显著高于260 m,这主要与地面较高的湿度相关.事实上,SOR随着湿度增加而迅速增大,进一步凸显了湿度对SO_2液相氧化的影响.另外,我们也发现SO_2特别是260 m在低湿范围(RH40%)内随湿度增加而逐渐升高,但在高湿范围(RH50%)内则呈下降趋势,说明不同湿度范围内的来源或者生成机制可能有所不同.SO_4~(2-)和PM_(2.5)浓度均随着湿度的增加而增加,但不同湿度范围,增加速率不同.通过相关性和和后向轨迹分析表明,区域输送(特别是途经北京西部和南部的气团)和本地燃煤排放分别是采暖前后污染物的主要来源.     

南京市大气细颗粒物二次组分的时空变化特征

在南京市六个典型点位,于2014~2015年的四个季节,开展了PM_(2.5)化学组分的监测.基于513个有效样本资料,分析了包括硫酸根(SO_4~(2-))、硝酸根(NO_3~-)、铵根(NH_4~+)和二次有机物(SOA)的二次组分的时空分布特征.结果表明:南京市PM_(2.5)以二次组分为主,约占57.7%,其中SO_4~(2-)、NO_3~-、NH_4~+和SOA年均浓度分别为11.9,12.5,7.7,8.7μg/m~3,所占PM_(2.5)的比例分别是17.2%、16.9%、10.5%、13.1%,其中98.8%的SO_4~(2-)为非海盐成分;近年来,[NO_3~-]/[SO_4~(2-)]快速增加,2015年约达到1.0,表明机动车的贡献日益突出;南京市二次组分季节差异较显著,NO_3~-、NH_4~+和SOA占比秋冬季节大于春夏季节,SO_4~(2-)占比春夏季节大于秋冬季节;空间分布上,二次组分的占比在远郊区最高(73.5%),其次是近郊新城区(59.0%),城市中心区和工业区最小(57.3%,57.4%),这反映了不同区域PM_(2.5)来源的差异;随着污染水平的上升,NO_3~-的占比显著增加,这表明机动车对于重污染过程具有更加重要的影响.研究结果深化了关于南京PM_(2.5)来源的认识,可以为更有效地控制灰霾污染提供科学依据.     

京津冀及周边地区PM_(2.5)传输规律研究

本研究采用WRF-CAMx模型对京津冀及周边7省市PM_(2.5)与SIA组分传输规律进行了研究,定量估算了京津冀地区PM_(2.5)与SIA的空间来源贡献,并得到了各省市之间的传输矩阵.结果表明,PM_(2.5)与SIA组分跨区域传输作用较为显著.京津冀区域PM_(2.5)与SIA组分外来源年均贡献分别为23.4%和45.5%.京津冀及周边各省市年均PM_(2.5)与SIA组分受本地排放影响分别为51.2%~68.8%与36.7%~56.4%.结合后向轨迹模型对北京市2013年1月4次重污染过程的空间来源进行了分析,发现各过程污染气团来向有明显差异,分别由西北方向长距离传输、南部短距离传输以及西南、东南方向局地气团输入.4次重污染过程PM_(2.5)区域传输作用显著,北京PM_(2.5)及SIA本地源贡献分别为35.1%~37.3%与17.1%~28.4%;其中偏南方向气团输入时,北京污染程度更高,且受京津冀排放源贡献较大,PM_(2.5)和SIA贡献率最高可达82.3%和76.4%.     

遵义PM_(2.5)中二次水溶性无机离子分布特征与来源

2014年3-12月,对遵义丁字口(市区点)和凤凰山(背景点)按季节进行了PM_(2.5)的样品采集,对其中二次水溶性无机离子(NH_4~+、NO_3~-、SO_4~(2-))分布特征及存在形态进行研究。结果表明,NH_4~+、NO_3~-和SO_4~(2-)是遵义市PM_(2.5)的主要离子,其季节变化规律明显:NO_3~-、SO_4~(2-)的质量浓度表现为秋冬春夏;NH_4~+则表现冬秋春夏。丁字口PM_(2.5)中NH_4~+、NO_3~-和SO_4~(2-)的质量浓度均高于凤凰山。相关性分析表明,遵义PM_(2.5)中NH_4~+、NO_3~-、SO_4~(2-)在春、冬季主要以(NH_4)_2SO_4和NH_4NO_3的形式存在;夏季主要以NH_4HSO_4和NH_4NO_3的形式存在;秋季主要以NH_4HSO_4的形式存在。PM_(2.5)的酸碱度分析显示遵义PM_(2.5)主要呈酸性。SOR(硫表观氧化率)和NOR(氮表观氧化率)均值大于0.1,且丁字口SOR、NOR值略高于凤凰山;丁字口、凤凰山NO_3~-/SO_4~(2-)年均值分别为0.46±0.08和0.43±0.10,说明遵义市大气中的硫和氮主要来自于固定源。     

杭州市PM2.5中水溶性离子的污染特征及其消光贡献

对杭州市2013年大气PM_(2.5)进行采样分析,探讨了其中水溶性离子的污染特征和消光贡献.杭州市PM_(2.5)中总水溶性离子的质量浓度为37.5μg·m~(-3),占PM_(2.5)质量浓度的44.4%,二次离子SNA(SO_4~(2-)、NO_3~-和NH_4~+)是水溶性离子的主要成分,共占到水溶性离子的83.4%.PM_(2.5)和主要水溶性离子的质量浓度都在冬季最大,夏季最低,夏秋季水溶性离子占PM_(2.5)的比值明显高于冬春季,而SNA在总水溶性离子中的比例4个季节非常接近.燃料燃烧和汽车尾气排放导致的二次离子生成,对杭州市PM_(2.5)贡献最大.SOR和NOR的年平均值分别为0.27和0.15,SO_2在大气中的转化率大于NO_x,SOR和NOR与相对湿度都呈现出明显正相关,非均相氧化过程对SO_4~(2-)和NO_3~-的生成具有重要贡献.气溶胶中[NO_3~-]/[SO_4~(2-)]的年平均值为0.63,主要受到燃煤排放的影响.霾天随着霾污染等级的逐渐加重,PM_(2.5)、水溶性离子和SNA的浓度都逐渐增大,SOR和NOR值也不断升高,霾天稳定的天气条件,能有效促进污染物的积累和二次转化.PM_(2.5)和SNA的质量浓度与大气消光系数都呈现出明显正相关,使用IMPROVE公式对不同化学组分消光系数的计算结果能够基本反映出气溶胶对大气散射的变化趋势,其结果显示SNA对大气总消光系数的贡献达60.8%.SNA的消光系数冬季最高,夏季最低,随着霾污染等级的加重,SNA的消光系数和对总消光的贡献比例也逐步增加.     

西安市重污染与清洁天PM2.5组分及其活性氧物质对比

针对重霾污染,在西安市冬季重污染日(2015-11-30~2015-12-09)和清洁日(2016-01-13~2016-01-22)各进行了为期10d的PM_(2.5)采集,测量其中的有机碳、元素碳,及NH_4~+、NO_3~-、SO_4~(2-)等无机水溶性离子,探讨两种污染条件下的组分特征及其成因.结果表明:观测期,重霾日和清洁日PM_(2.5)质量浓度分别为(170±47.5)μg·m~(-3)和(48.6±17.9)μg·m~(-3),且重霾日伴随低能见度、高湿静风等多种不利气象条件;重霾日二次无机离子(NH_4~+、NO_3~-、SO_4~(2-))组分占PM_(2.5)质量浓度的49.8%±13.1%,而清洁日为19.4%±5.95%,并且重霾日硫氧化速率(sulfur oxidation ratio,SOR)和氮氧化速率(nitrogen oxidation ratio,NOR)分别为0.282±0.157和0.269±0.124,远高于清洁日(SOR和NOR分别为0.189±0.057和0.077±0.046),重霾日二次有机组分浓度[(6.22±3.87)μg·m~(-3)]是清洁日[(1.44±1.63)μg·m~(-3)]的5倍,表明二次污染及不利气象条件是造成重霾期间相关组分浓度升高的重要原因.最后,通过二氯荧光黄双乙酸盐(2',7'-DCFH)化学荧光分析法测定了其中活性氧物质(reactive oxygen species,ROS)的浓度,探讨其对于二次无机组分形成的影响,结果表明观测期ROS平均浓度(以H_2O_2计)分别为(4.99±1.54)nmol·m~(-3)(重霾期),(0.492±0.356)nmol·m~(-3)(清洁期),二次反应及积累效应可能是西安重霾条件下ROS浓度升高的主要原因.NO_3~-、SO_4~(2-)与ROS均呈现正相关(P0.05),表明ROS可能通过二次氧化过程参与到二次无机组分形成过程中.     

安阳市大气PM2.5中水溶性离子季节特征及来源解析

为探究安阳市大气PM_(2.5)中水溶性离子的污染特征及其来源,于2018～2019年的典型月份在安阳市采集PM_(2.5)样品,使用离子色谱测试了9种水溶性离子(Na~+、NH_4~+、K~+、Mg~(2+)、Ca~(2+)、F~-、Cl~-、NO_3~-和SO_4~(2-)).开展了PM_(2.5)和水溶性离子浓度水平的分析、阴阳离子平衡和氮氧化率(NOR)、硫氧化率(SOR)的计算、离子相关性和主成分分析等.结果表明,安阳市PM_(2.5)和水溶性离子年均浓度分别为(85.81±45.43)μg·m~(-3)和(48.21±30.04)μg·m~(-3),各离子浓度高低顺序为NO_3~-SO_4~(2-)NH_4~+ Cl~-K~+ Ca~(2+) Na~+Mg~(2+)F~-;阴阳离子电荷当量数值为0.75～0.94,大气气溶胶显碱性;NH_4~+和SO_4~(2-)、NO_3~-以及K~+和Cl~-等具有显著的相关性;氮氧化率(NOR)和硫氧化率(SOR)的年均值分别为0.25和0.37;SO_4~(2-)、NO_3~-和NH_4~+(SNA)的年均浓度为(42.72±27.87)μg·m~(-3),占水溶性离子总量的87.14%;春季、夏季和秋季的NH_4~+主要以(NH_4)_2SO_4和NH_4NO_3的形式存在,冬季的NH_4~+主要以(NH_4)_2SO_4、NH_4NO_3和NH_4 Cl的形式存在;水溶性离子主要来自于二次生成、燃煤、生物质燃烧和扬尘.     

Evaluation of phytoextracting cadmium and lead by sunflower, ricinus, alfalfa and mustard in hydroponic culture

Soil contaminated with heavy metals cadmium(Cd)and lead(Pb)is hard to be remediated.Phytoremediation may be a feasible method to remove toxic metals from soil,but there are few suitable plants which can hyperaccumulate metals.In this study,Cd and Pb accumulation by four plants including sunflower(Helianthus annuus L.),mustard(Brassica juncea L.),alfalfa(Medicago sativa L.), ricinus(Ricinus communis L.)in hydroponic cultures was compared.Results showed that these plants could phytocxtract heavy metals, the ability of accumulation differed with species,concentrations and categories of heavy metals.Values of BCF(bioconcentration factor)and TF(translocation factor)indicated that four species had dissimilar abilities of phytoextraction and transportation of heavy metals.Changes on the biomass of plants,pH and Eh at different treatments revealed that these four plants had distinct responses to Cd and Pb in cultures.Measurements should be taken to improve the phytoremediation of sites contaminated with heavy metals,such as pH and Eh regulations,and so forth.     

Oxidation of As(Ⅲ) by potassium permanganate

The oxidation of As(Ⅲ) with potassium permanganate was studied under conditions including pH, initial As(Ⅲ) concentration and dosage of Mn(Ⅶ). The results have shown that potassium permanganate was an effective agent for oxidizing of As(Ⅲ) in a wide pH range. The pH value of tested water was not a significant factor affecting the oxidation of As(Ⅲ) by Mn(Ⅶ). Although theoretical redox analyses suggest that Mn(Ⅶ) should have better performance in oxidization of As(Ⅲ) within lower pH ranges, the experimental results show that the oxidation efficiencies of As(Ⅲ) under basic and acidic conditions were similar, which may be due to the adsorption of As(Ⅲ) on the Mn(OH)2 and MnO2 resulting from the oxidation of As(Ⅲ).     

Distribution and ecological effect of mercury in Laogang landfill, Shanghai, China

Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day, Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For topsoil samples, there were significant correlations among total mercury （HgT）, combinative mercury （Hgc） and gaseous mercury （HgG）, and content of total organic carbon （TOC）, but, no significantly relationship was found between Hg content and filling time. Hg content changes in vertical profiles with time showed that the average Hgv of profiles 1992, 1996, and 2000 was similar, but their average HgG was quite different. HgT was significantly correlated with Hgc in profile 1992 and 2000, and Hgv was significantly correlated with Hg6 in profile 1996. HgG/Hgv ratio in profile samples decreased in the order of （HgG,/HgT）1992〉（HgG/HgT）1996〉〉（HgG/HgT）2000. A simple outline of Hg release in landfill could be drawn： with increasing of filling time, degradation undergoes different biodegradation, accordingly, gaseous mercury goes through small, more, and small proportion to total mercury. Distribution of Hg in plants was inhomogeneous, following the order of leaf〉root〉stem. The highest value of leaf may be associated with higher atmospheric Hg from landfill. Ligneous plants （e.g. Phyllostachys glanca, Prunus salicina and Ligustrum lucidum） are capable of enriching more Hg than herbaceous plants.     

EDTA-enhanced phytoremediation of lead contaminated soil by Bidens maximowicziana

Phytoremediation is a potential cleanup technology for the removal of heavy metals from contaminated soils.Bidens maximowicziana is a new Pb hyperaccumulator,which not only has remarkable tolerance to Pb but also extraordinary accumulation capacity for Pb.The maximum Pb concentration was 1509.3 mg/kg in roots and 2164.7 mg/kg in overground tissues.The Pb distribution order in the B. maximowicziana was:leaf>stem>root.The effect of amendments on phytoremediation was also studied.The mobility of soil Pb and the Pb concentrations in plants were both increased by EDTA application.Compared with CK(control check),EDTA application promoted translocation of Pb to overground parts of the plant.The Pb concentrations in overground parts of plants was increased from 24.23-680.56 mg/kg to 29.07-1905.57 mg/kg.This research demonstrated that B.maximowicziana appeared to be suitable for phytoremediation of Pb contaminated soil,especially,combination with EDTA.     

Decomposition of alachlor by ozonation and its mechanism

Decomposition and corresponding mechanism of alachlor, an endocrine disruptor in water by ozonation were investigated. Results showed that alachlor could not be completely mineralized by ozone alone. Many intermediates and final products were formed during the process, including aromatic compounds, aliphatic carboxylic acids, and inorganic ions. In evoluting these products, some of them with weak polarity were qualitatively identified by GC-MS. The information of inorganic ions suggested that the dechlorination was the first and the fastest step in the ozonation of alachlor.     

Enzymatic oxidation of aqueous pentachlorophenol

The influence of the nonionic surfactant Tween 80 on pentachlorophenol （PCP） oxidation catalyzed by horseradish peroxidase was studied. The surfactant was tested at concentrations below and above its critical micelle concentration （CMC）. Enhancement of PCP removal was observed at sub-CMCs. The presence of Tween 80 in the reaction mixture reduced enzyme inactivation which occurred through a combination of free radical attack and sorption by precipitated products. A simple first-order model was able to simulate time profiles for enzyme inactivation in the presence or absence of Tween 80. At supra-CMCs, the surfactant caused noticeable reductions in PCP removal, presumably through micelle partitioning of PCP which precluded the hydrophobic PCP molecule from interacting with the enzyme.     

Chlorobenzenes in waterweeds from the Xijiang River （Guangdong section） of the Pearl River

The Xijiang River is the major source of water for about 4.5 millions of urban population and 28.7 millions of rural population. The water quality is very important for the health of the rural population. The concentration and distribution of chlorobenzenes (CBs) in both water and waterweeds collected from 4 stations in the Xijiang River (Gangdong section) of the Pearl River in April and November were determined. The result showed that nearly every congener of CBs was detected. The total contents of CBs (∑CBs) in the river water ranged from 111.1 to 360.0 ng/L in April and from 151.9 to 481.7 ng/L in November, respectively. The pollution level of CBs in the water in April was higher than that in November. The contents of ∑ CBs in waterweeds ranged from 13.53×102 μg/g to 38.27×102μg/g dry weight (dw). There was no significant difference between April and November in waterweeds. The distribution of CBs in roots, caulis, and leaves of Vallisneria spiralis L. showed different patterns. The leaves mainly contained low-molecular-weight CBs(DCBs), whereas the roots accumulated more PCBs and HCBs. The average lgBCFlip (bioconcentration factor) of CBs ranged from 0.64 to 3.57 in the waterweeds. The spatial distribution character of CBs in the Xijiang River was: Fengkai County ＜ Yunan County ＜Yun'an County ＜ Gaoyao County according to the ∑CBs, and the pollution deteriorated from the upstream to the downstream of the Xijiang River. Further analysis demonstrated that the discharge of waste containing CBs may be the main source of CBs pollution in the Xijiang River.     

Degradation of 2,4-dichlorophenol with a novel TiO2/Ti-Fe-graphite felt photoelectrocatalytic oxidation process

Degradation of 2,4-dichlorophenol(2,4-DCP)was studied in a novel three-electrode photoelectrocatalytic(PEC)integrative oxidation process,and the factors influencing the degradation rate,such as applied current,flow speed of O_2,pH,adscititious voltage and initial 2,4-DCP concentration were investigated and optimized.H_2O_2 was produced nearby cathode and Fe~(2 )continuously generated from Fe anode in solution when current and O_2 were applied,so,main reactions,H_2O_2-assisted TiO_2 PEC oxidation and E-Fenton reaction,occurred during degradation of 2,4-DCP in this integrative system.The degradation ratio of 2,4-DCP was 93% in this integrative oxidation process,while it was only 31% in E-Fenton process and 46% in H_2O_2-assisted TiO_2 PEC process.So,it revealed that the degradation of 2,4-DCP was improved greatly by photoelectrical cooperation effect.By the investigation of pH,it showed that this integrative process could work well in a wide pH range from pH 3 to pH 9.     

Effect of copper on the degradation of pesticides cypermethrin and cyhalothrin

The influence of coexisting copper (Cu) ion on the degradation of pesticides pyrethroid cypermethrin and cyhalothrin in soil and photodegradation in water system were studied.Serial concentrations of the pesticides with the addition of copper ion were spiked in the soil and incubated for a regular period of time,the analysis of the extracts from the soil was carried out using gas chromatography (GC).The photodegradation of pyrethroids in water system was conducted under UV irradiation.The effect of Cu~(2 ) on the pesticides degradation was measured with half life (t_(0.5)) of degradation.It was found that a negative correlation between the degradation of the pyrethroid pesticides in soil and Cu addition was observed.But Cu~(2 ) could accelerate photodegradation of the pyrethroids in water.The t_(0.5) for cyhalothrin extended from 6.7 to 6.8 d while for cypermethrin extended from 8.1 to 10.9 d with the presence of copper ion in soil.As for photodegradation,t_(0.5) for cyhalothrin reduced from 173.3 to 115.5 rain and for cypermethrin from 115.5 to 99.0 min.The results suggested that copper influenced the degradation of the pesticides in soil by affecting the activity of microorganisms.However, it had catalyst tendency for photodegradation in water system.The difference for the degradation efficiency of pyrethroid isomers in soil was also observed.Copper could obviously accelerate the degradation of some special isomers.     

基于综合水质标识指数和对应分析法的校园河道水质评价

以三峡大学的校园河道求索溪为研究对象,利用综合水质标识指数法确定求索溪水质类别,分析其水质时空变化规律,并利用对应分析法得出求索溪中不同监测点的主要污染因子.研究结果表明:求索溪整体的综合水质标识指数为7.423,整体水质为劣V类(地表水环境质量标准GB 3838-2002)且黑臭.从时间变化来看,求索溪4月份的水质最差,5月份次之,4、5月份所有监测点的水质都劣于V类且黑臭;8月份水质最好,水质为Ⅳ类;从空间分布来看,8个监测点综合水质标识指数均超过6.0,水质为劣V类,其中6号监测点的水质相对最好,监测点3号的水质相对最差;对应分析法得出求索溪的整体水体污染程度受总氮因子的影响最大,其次为总磷.该研究拟为求索溪及类似校园河道的水环境治理研究提供基础依据和参考.