Enshi River turned green because of the addition of sodium fluorescein. What substance is this?

? Sodium fluorescein is orange-red powder, odorless and hygroscopic; Soluble in water, the solution is yellowish red with strong yellow-green fluorescence, which disappears after acidification and reappears after neutralization or alkalization. Sodium fluorescein is non-toxic and harmless, easy to decompose when exposed to light, and will naturally dissipate in a short time.

The reason why Enshi River turns green is that the tracer sodium fluorescein (sodium fluorescein is non-toxic and harmless, easy to decompose at the sight of light, and will naturally dissipate in a short time) was put into use by Hubei Water Resources and Hydropower Planning, Survey and Design Institute when Longdongwan Reservoir was connected. At present, the county water supply company has suspended water supply, and environmental protection, water conservancy and other departments have taken water samples for inspection, and will resume water supply after the water samples meet the standards. ?

We know that Enshi belongs to Hubei Province and is the selenium capital of the world, where the selenium content is extremely high. Enshi has a relatively large area of nearly 4,000 square kilometers and a population of more than 4 million. Enshi is not a prefecture-level city, but a county-level city, which has jurisdiction over 3 towns and 3 streets 10 villages. Enshi, as a county-level city, has developed very well in recent years, with the total economic GDP exceeding 87 billion yuan, which is quite successful for a small county-level city.

There are many rivers in Enshi, with abundant and intensive hydropower resources, and there is great development potential here. The area where Enshi River turns green is located in the upper reaches of Mao Ye River in Enshi County. It was found that it had turned green, and the county water conservancy bureau, Xianfeng branch of the state ecological environment bureau, county water supply company and other parts quickly went to investigate and deal with it, which is currently in the stage of incident resolution.

Enshi is rich in hydropower resources, which has a great impact on the lives of local residents, so the river turned green and attracted the attention of netizens. Fortunately, fluorescein sodium is harmless and non-toxic, easy to decompose when exposed to light, and will naturally dissipate in a short time, so far no casualties have been caused. Water is the source of our life. Everyone needs to pay enough attention to the drinking water in life, and it can only be drunk after high temperature disinfection. Never drink river water at will to avoid accidental injury to your body.