7 results about "Soil lead" patented technology

The application discloses an L-cysteine-based soil lead pollution leaching agent and a preparation method thereof, and belongs to the technical field of soil heavy metal pollution remediation. The L-cysteine-based soil lead pollution leaching agent comprises the following raw materials: an L-cysteine solution, a pH buffer and a polyvinylpyrrolidone solution; the concentration of the L-cysteine solution is 0.3-0.5 mmol / L, the concentration of the pH buffer is 1 mmol / L, and the mass fraction of the polyvinylpyrrolidone solution is 0.003%-0.005%; the volume ratio of the L-cysteine solution, the pH buffer and the polyvinylpyrrolidone solution is 1:1:0.15-0.4. The leaching agent has a remarkable leaching effect on soil lead, and the removal rate of the leaching agent on the contaminated soil with a Pb content of more than 500 mg / kg can reach more than 85%, so that the leaching agent can effectively prevent lead from migrating through the soil into a food chain or a water environment, and is much stronger than a traditional carboxyl-based leaching agent.

In one embodiment, contamination detection includes attaching a front-facing side of a detector enclosure to a ripper of a ripper machine. The detector enclosure includes a rear-facing side having a rear-facing window, two lateral-facing sides, and a bottom-facing side. A detector is disposed inside the detector enclosure. The ripper is inserted into a soil to position the rear-facing window, the two lateral-facing sides, and the bottom-facing side of the detector enclosure below a soil surface of the soil. The ripper is moved horizontally through the soil leading with the front-facing side of the detector enclosure to detect subsurface contamination via the rear-facing window using the detector.

This invention discloses a rapid detection method and system for lead in soil based on quantum dot fluorescence, specifically relating to the fields of optical detection and fluorescence analysis. It addresses the problem of fluorescence signal distortion caused by non-specific heterogeneous aggregation of nanoparticles in the extract solution when existing quantum dot fluorescent probes detect lead in soil. The method acquires the fluorescence spectrum of the mixed system and separates the characteristic fluorescence peaks of the quantum dots. It performs time-resolved measurements of the fluorescence signal, divides the time window of the fluorescence lifetime decay curve according to a preset time threshold, and calculates the integral area. Simultaneously, it analyzes the quenching kinetics of the characteristic fluorescence peak intensity to obtain the fluorescence quenching rate constant, and calculates the lifetime distribution characteristic ratio based on the integral area of ​​the time window. It determines the contribution ratio of non-specific aggregation to the fluorescence quenching rate constant through cooperative deviation analysis. Based on this ratio, it compensates and corrects the intensity of the characteristic fluorescence peak, accurately calculating the lead ion concentration in the soil extract solution.

The application discloses a kind of self-adapting multidimensional rectification and collaborative penetration control system and method of suction foundation group.The system is composed of multi-source perception, central control and distributed execution module.The system establishes master-slave collaborative control architecture, the effective soil penetration resistance of bottom of cylinder is real-time inversion through soil resistance soft measurement unit, and geological uneven area is identified in advance.The execution module is configured with two-way fluid control pump station, and differential negative pressure suction sinking is carried out under normal working condition.When extreme soft soil leads to inclination overrun, the pump station on the side of sinking too fast is automatically controlled to switch to positive pressure water injection mode, active jacking torque is generated to rectify powerfully, and anti-pipe heaving protection is assisted.The application effectively solves the problem that suction foundation is prone to irreversible inclination in soft and hard uneven geology, and realizes automatic and high-precision collaborative penetration installation.

The application belongs to the technical field of heavy metal pollution treatment, and relates to a preparation of a weak alkaline soil cadmium passivator and a method for passivating soil lead. The weak alkaline soil cadmium passivator mainly comprises the following components in parts by weight: graphene oxide modified biochar 20-30 parts, montmorillonite 5-10 parts, bentonite 5-10 parts and microbial inoculum 5-10 parts, wherein the microbial inoculum is a composite inoculum composed of Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus thuringiensis and Pseudomonas nitroreducens. The weak alkaline soil cadmium passivator has a good repairing effect on cadmium and lead in contaminated soil, can significantly improve the physicochemical properties of cadmium and / or lead contaminated soil, increase the soil organic matter content, reduce the migration in the environment, reduce the cadmium content in crops, and has great market promotion value.

The invention relates to the technical field of soil detection, and discloses equipment and method for detecting lead and cadmium in soil based on a graphite furnace method.The equipment comprises a bottom plate, a protective cover is connected to the upper end of the bottom plate, a rotating disc is rotatably connected to the upper end of the bottom plate, a digestion tank is arranged above the rotating disc, a funnel is connected to the upper end of the digestion tank, and a transfer table is slidably connected to the funnel; a partition strip is connected into the transfer table, one side of the partition strip is rotationally connected with a sector plate, a sliding block is slidably connected to the bottom plate, one side of the sliding block is connected with a supporting ring, the transfer table is sleeved with the supporting ring, a sliding frame is connected to the upper end of the bottom plate, and a beating frame is connected to the sliding frame. Closed quantitative feeding of soil samples is achieved, sample loss and detection precision deviation caused by flying dust generated by manual transfer are avoided, meanwhile, sample blockage at an inlet of the digestion tank can be prevented in an intermittent discharging mode, and the stability and precision of the feeding link are improved.

The application relates to the field of agricultural planting technology, and discloses a planting method for reducing the lead content of wheat by combining chelation induction and leaf surface control, which comprises the following steps: firstly, detecting and screening the soil lead, implementing differentiated deep plowing and soil conditioner application on lead-free land and low-lead land, adopting standard deep plowing and applying silicon calcium mineral materials and biological agents on the lead-free land; deepening the deep plowing and applying a composite passivation regulator containing calcium dihydrogen phosphate, modified biochar and sepiolite on the low-lead land, shallow plowing before sowing and base application of an EDDS and citric acid compound chelation inducer, implementing differentiated leaf surface nutrient spraying and rhizosphere management at the seedling stage, spraying a leaf surface control agent at the jointing stage to construct a siliconized cell barrier, performing leaf surface control and nutrient synergistic spraying at the booting stage to the filling stage, dynamically monitoring the lead transport risk, and finally detecting the lead content and verifying the quality at the mature stage; through three-level synergistic control of the soil-root-leaf, the lead content of the wheat grains approaches 0.