40 C.F.R. § 421.284
Standards of performance for new sources.
Cite as 40 C.F.R. § 421.284 (2026)
Any new source subject to this subpart shall achieve the following new source performance standards: (a) Tantalum alloy leach and rinse. NSPS for the Secondary Tantalum Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum powder produced Copper 295.200 140.700 Lead 64.570 29.980 Nickel 126.800 85.320 Zinc 235.200 96.850 Tantalum 103.800 Total suspended solids 3,459.000 2,767.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (b) Capacitor leach and rinse. NSPS for the Secondary Tantalum Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum powder produced from leaching Copper 25.860 12.320 Lead 5.656 2.626 Nickel 11.110 7.474 Zinc 20.600 8.484 Tantalum 9.090 Total suspended solids 303.000 242.400 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (c) Tantalum sludge leach and rinse. NSPS for the Secondary Tantalum Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced Copper 262.800 125.200 Lead 57.480 26.690 Nickel 112.900 75.960 Zinc 209.400 86.230 Tantalum 92.390 Total suspended solids 3,080.000 2,464.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (d) Tantalum powder acid wash and rinse. NSPS for the Secondary Tantalum Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum powder produced Copper 0.448 0.214 Lead 0.098 0.046 Nickel 0.193 0.130 Zinc 0.357 0.147 Tantalum 0.158 Total suspended solids 5.250 4.200 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (e) Leaching wet air pollution control. NSPS for the Secondary Tantalum Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced Copper 6.246 2.977 Lead 1.366 0.634 Nickel 2.684 1.806 Zinc 4.978 2.050 Tantalum 2.196 Total suspended solids 73.200 58.560 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times.