The concentration of chlorophyll in the water body reflects the content of phytoplankton. Monitoring the content of chlorophyll in water can determine the degree of eutrophication of the water body, and provide early warning of water pollution, algae blooms, and red tides. The chlorophyll sensor adopts the measurement principle of fluorescence method: the substance to be measured is irradiated with excitation light of a certain wavelength to excite it to a high-energy state, and when it returns to the ground state from the high-energy state, it will emit fluorescence greater than the excitation wavelength. The excited fluorescence intensity is the same as that of the substance to be measured Concentration dependent. Digital chlorophyll sensor is an online electrode with RS485 communication interface and standard Modbus communication protocol. Based on fluorescence optical method technology, the chlorophyll sensor has strong anti-interference, high sensitivity, no need for pretreatment, fast measurement, and can measure chlorophyll a of water quality. The chlorophyll sensor is used for plants, algae growth, water eutrophication; early warning of algae outbreaks; the best choice for studying water ecosystems.
chlorophyll sensor, chlorophyll probe, chlorophyll sensor water Suzhou Delfino Environmental Technology Co., Ltd. , https://www.daruifuno.com
At the end of October this year, the European Union set the total allowable emission limit for the third period of the EU's emissions trading system. The 2.039 billion tons of carbon dioxide emission limit has far exceeded the 1.927 billion tons that was determined in July this year. Taking into account the uncertainty caused by the inclusion of new industries and new greenhouse gases in the third period, the total emission allowance may be adjusted before 2013, but the principle of ensuring the enthusiasm of participants in reducing emissions and stabilizing carbon prices will not be Will change.
It is understood that from 2013 onwards, existing power plants in the European Union can obtain some free emission allowances in addition to the power plants with central heating and high-efficient waste heat power generation. Other power companies will adopt full auctions to obtain emission allowances, and other industry emission quotas. It will also gradually shift to a full auction mode: Starting from 2013, these companies will obtain 20% of the emission quota through auctions, and gradually increase this percentage each year, reaching 70% by 2020 and achieving full auctions by 2027.
For new EU member states, at least 30% of their electricity company's emission quotas were obtained through auctions in 2013, and will gradually increase the proportion of auctions to reach 100% by 2020. The move is to encourage companies to use the best energy efficiency technologies.
At present, China has clearly stated that the “carbon dioxide emissions per unit of GDP of the country by 2020 should be 40%-45% lower than in 2005,†and the “12th Five-Year Plan†proposal also explicitly states that China should gradually establish carbon emissions. In the carbon market, policy constraints will be conducive to the integrity of gas emission reduction efforts and promote the healthy development of the carbon trading market. 
At the just-concluded UN climate conference in Cancun, the EU set stricter emission reduction targets for the third phase of the EU's emissions trading system. The third phase incorporates more types of greenhouse gases from more industries: including carbon dioxide emissions from the petrochemical, amminochemical, and aluminum manufacturing industries, and oxide production from production, adipic acid (AA), and glyoxylic acid emissions. Nitrogen, carbon dioxide capture, transportation and storage.