富阳区地表水中叶绿素a检测数据

叶绿素a是植物光合作用中的重要光合色素，是藻类的重要组成成分之一。叶绿素a含量的高低与水体中藻类的种类、数量密切相关。是判定水质好坏的重要指标，从而为地表水的水质分析评价提供事实依据。1、数据来源:按照水质《水质 叶绿素a的测定 分光光度法 HJ 897-2017》对地表水进行水样采集检测。2、算法规则: 按照如下公式进行计算:ρ=[（11.85（A664-A750）-1.54(A647-A750)-0.08(A630-A750)）*V1/V]，式中ρ为样品中叶绿素a的质量浓度，单位μg/L；A664为试样在664nm波长下的吸光度值；A647为试样在647nm波长下的吸光度值；A630为试样在630nm波长下的吸光度值；A750为试样在750nm波长下的吸光度值；V1为试样定容体积，单位m1；V为取样体积，单位L。3、数据判定: 根据《地表水环境质量标准》，对地表水中的叶绿素a无限值要求。4、数据应用：通过分析水样中的叶绿素a质量浓度，我们可以判断该地表水的水质好坏，避免因叶绿素a浓度含量超高引起的水质问题，为监管提供依据。Chlorophyll a is an important photosynthetic pigment in plant photosynthesis and one of the core components of algae. The content of chlorophyll a is closely correlated with the species and quantity of algae in water bodies, and it serves as a critical indicator for water quality assessment, providing factual basis for the analysis and evaluation of surface water quality. 1. Data Source: Water samples were collected and tested from surface water bodies in accordance with the standard *Determination of Chlorophyll a in Water by Spectrophotometry* (HJ 897-2017). 2. Algorithm Rules: The calculation is performed using the following formula: ρ = [(11.85(A664 - A750) - 1.54(A647 - A750) - 0.08(A630 - A750)) × V1] / V In this formula, ρ is the mass concentration of chlorophyll a in the sample, with the unit of μg/L; A664 is the absorbance of the test sample at 664 nm; A647 is the absorbance at 647 nm; A630 is the absorbance at 630 nm; A750 is the absorbance at 750 nm; V1 is the fixed volume of the test sample, with the unit of m1; V is the sampled volume, with the unit of L. 3. Data Judgment: According to the *Environmental Quality Standards for Surface Water*, there is no limit value requirement for chlorophyll a in surface water. 4. Data Application: By analyzing the mass concentration of chlorophyll a in water samples, the water quality of the corresponding surface water body can be evaluated. This helps prevent water quality issues caused by excessively high chlorophyll a concentrations and provides evidence for environmental supervision.