Degradation of High-Concentration Nitrate Nitrogen in Groundwater: A Laboratory Study

Table 1

Detection method of test index.

Serial number	Index	Detection method
1	pH	Hash electrode method
2	ORP	Hash electrode method
3	NO3^−-N	Ultraviolet spectrophotometry
4	NO2^−-N	N-(1-naphthyl)-ethylenediamine spectrophotometry
5	NH4^+-N	Nessler’s reagent spectrophotometry